diff --git a/src/browser/app/profile/zen-browser.js b/src/browser/app/profile/zen-browser.js
index 00d8979ec..7aca33bc9 100644
--- a/src/browser/app/profile/zen-browser.js
+++ b/src/browser/app/profile/zen-browser.js
@@ -31,6 +31,7 @@ pref("browser.privateWindowSeparation.enabled", false);
 // Mica
 pref("widget.windows.mica", true);
 pref("widget.windows.mica.popups", true);
+pref("widget.windows.mica.toplevel-backdrop", 2);
 #endif
 
 pref('browser.newtabpage.activity-stream.newtabWallpapers.enabled', true);
@@ -142,10 +143,6 @@ pref('zen.view.experimental-rounded-view', false);
 pref('zen.view.experimental-rounded-view', true);
 #endif
 
-#ifdef XP_WIN
-pref('zen.widget.windows.acrylic', true);
-#endif
-
 // Glance
 pref('zen.glance.enabled', true);
 pref('zen.glance.hold-duration', 300); // in ms
diff --git a/src/browser/components/customizableui/CustomizableUI-sys-mjs.patch b/src/browser/components/customizableui/CustomizableUI-sys-mjs.patch
index 472726e1e..b21bedfd1 100644
--- a/src/browser/components/customizableui/CustomizableUI-sys-mjs.patch
+++ b/src/browser/components/customizableui/CustomizableUI-sys-mjs.patch
@@ -1,5 +1,5 @@
 diff --git a/browser/components/customizableui/CustomizableUI.sys.mjs b/browser/components/customizableui/CustomizableUI.sys.mjs
-index 91088fab1759b9af908912648d28daa5938a29c9..999c1950e25560164463ac57773ca7fedac6255f 100644
+index 91088fab1759b9af908912648d28daa5938a29c9..3f52ee8cd77ac171fd2cbf355ade1371e57d0db5 100644
 --- a/browser/components/customizableui/CustomizableUI.sys.mjs
 +++ b/browser/components/customizableui/CustomizableUI.sys.mjs
 @@ -13,6 +13,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
@@ -114,9 +114,9 @@ index 91088fab1759b9af908912648d28daa5938a29c9..999c1950e25560164463ac57773ca7fe
     *   The identifier string of the area that aNode is being inserted into.
     */
    insertWidgetBefore(aNode, aNextNode, aContainer, aAreaId) {
-+    if (aArea === CustomizableUI.AREA_NAVBAR && aNode.ownerGlobal.gZenVerticalTabsManager._hasSetSingleToolbar) {
++    if (aAreaId === CustomizableUI.AREA_NAVBAR && aNode.ownerGlobal.gZenVerticalTabsManager._hasSetSingleToolbar) {
 +      aContainer = aNode.ownerDocument.getElementById("zen-sidebar-top-buttons-customization-target");
-+      aArea = "zen-sidebar-top-buttons";
++      aAreaId = "zen-sidebar-top-buttons";
 +    }
      this.notifyDOMChange(aNode, aNextNode, aContainer, false, () => {
        this.setLocationAttributes(aNode, aAreaId);
diff --git a/src/browser/components/tabbrowser/content/tabbrowser-js.patch b/src/browser/components/tabbrowser/content/tabbrowser-js.patch
index 78a5ee1f1..77ee31337 100644
--- a/src/browser/components/tabbrowser/content/tabbrowser-js.patch
+++ b/src/browser/components/tabbrowser/content/tabbrowser-js.patch
@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabbrowser.js b/browser/components/tabbrowser/content/tabbrowser.js
-index bfba253af3253a8cf547a5d69a1695651fc5c203..fca9c6c918f7d2353edd4f675dd19ca4c4208a50 100644
+index bfba253af3253a8cf547a5d69a1695651fc5c203..1ba8b8c51f27d92222f1e682681cf9c9f61ca14c 100644
 --- a/browser/components/tabbrowser/content/tabbrowser.js
 +++ b/browser/components/tabbrowser/content/tabbrowser.js
 @@ -415,11 +415,67 @@
@@ -638,8 +638,8 @@ index bfba253af3253a8cf547a5d69a1695651fc5c203..fca9c6c918f7d2353edd4f675dd19ca4
          }
        }
 -
-+      if (tab.group?.hasAttribute("split-view-group")) {
-+        tab = tab.group;
++      if (element.group?.hasAttribute("split-view-group")) {
++        element = element.group;
 +      }
        // Don't allow mixing pinned and unpinned tabs.
        if (element.pinned && !targetElement?.pinned) {
@@ -652,7 +652,7 @@ index bfba253af3253a8cf547a5d69a1695651fc5c203..fca9c6c918f7d2353edd4f675dd19ca4
 +        targetElement = targetElement.group;
 +      }
        let getContainer = () => {
-+        if (tab.hasAttribute("zen-essential")) {
++        if (element.hasAttribute("zen-essential")) {
 +          return document.getElementById("zen-essentials-container");
 +        }
          if (element.pinned && this.tabContainer.verticalMode) {
diff --git a/src/browser/components/tabbrowser/content/tabs-js.patch b/src/browser/components/tabbrowser/content/tabs-js.patch
index 542406423..94d7c924d 100644
--- a/src/browser/components/tabbrowser/content/tabs-js.patch
+++ b/src/browser/components/tabbrowser/content/tabs-js.patch
@@ -1,8 +1,8 @@
 diff --git a/browser/components/tabbrowser/content/tabs.js b/browser/components/tabbrowser/content/tabs.js
-index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc977c8415 100644
+index ef9c0389ec926e6bc01c0dc3b883beceaf1f7d43..5ba36f48da0d85cf9be1abcd8d5446e1a977b7b1 100644
 --- a/browser/components/tabbrowser/content/tabs.js
 +++ b/browser/components/tabbrowser/content/tabs.js
-@@ -93,7 +93,7 @@
+@@ -83,7 +83,7 @@
        };
        this.arrowScrollbox._canScrollToElement = element => {
          if (isTab(element)) {
@@ -11,7 +11,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          }
          return true;
        };
-@@ -347,7 +347,7 @@
+@@ -342,7 +342,7 @@
        // and we're not hitting the scroll buttons.
        if (
          event.button != 0 ||
@@ -20,7 +20,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          event.composedTarget.localName == "toolbarbutton"
        ) {
          return;
-@@ -396,6 +396,7 @@
+@@ -391,6 +391,7 @@
              // Reset the "ignored click" flag
              target._ignoredCloseButtonClicks = false;
            }
@@ -28,8 +28,8 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          }
  
          /* Protects from close-tab-button errant doubleclick:
-@@ -693,7 +694,7 @@
-       if (this.#isContainerVerticalPinnedExpanded(tab)) {
+@@ -692,7 +693,7 @@
+       if (this.#isContainerVerticalPinnedGrid(tab)) {
          // In expanded vertical mode, the max number of pinned tabs per row is dynamic
          // Set this before adjusting dragged tab's position
 -        let pinnedTabs = this.visibleTabs.slice(0, gBrowser.pinnedTabCount);
@@ -37,7 +37,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          let tabsPerRow = 0;
          let position = 0;
          for (let pinnedTab of pinnedTabs) {
-@@ -899,6 +900,10 @@
+@@ -913,6 +914,10 @@
        }
  
        let draggedTab = event.dataTransfer.mozGetDataAt(TAB_DROP_TYPE, 0);
@@ -47,8 +47,8 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
 +      }
        if (
          (effects == "move" || effects == "copy") &&
-         this == draggedTab.container &&
-@@ -1012,6 +1017,18 @@
+         document == draggedTab.ownerDocument &&
+@@ -1069,6 +1074,18 @@
  
        this._tabDropIndicator.hidden = true;
        event.stopPropagation();
@@ -60,14 +60,14 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
 +        let moved = gZenPinnedTabManager.moveToAnotherTabContainerIfNecessary(event, movingTabs);
 +
 +        if (moved) {
-+          this._finishMoveTogetherSelectedTabs(draggedTab);
++          this.finishMoveTogetherSelectedTabs(draggedTab);
 +          return;
 +        }
 +      }
        if (draggedTab && dropEffect == "copy") {
-         // copy the dropped tab (wherever it's from)
-         let newIndex = this._getDropIndex(event);
-@@ -1050,10 +1067,11 @@
+         let duplicatedDraggedTab;
+         let duplicatedTabs = [];
+@@ -1108,10 +1125,11 @@
            }
          } else {
            let isPinned = draggedTab.pinned;
@@ -83,8 +83,8 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            );
            let size = this.verticalMode ? "height" : "width";
            let screenAxis = this.verticalMode ? "screenY" : "screenX";
-@@ -1129,7 +1147,7 @@
-                 tab.removeAttribute("tabdrop-samewindow");
+@@ -1203,7 +1221,7 @@
+                 item.removeAttribute("tabdrop-samewindow");
                  resolve();
                };
 -              if (gReduceMotion) {
@@ -92,22 +92,18 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
                  postTransitionCleanup();
                } else {
                  let onTransitionEnd = transitionendEvent => {
-@@ -1246,7 +1264,7 @@
-               return;
-             }
-           }
--
+@@ -1327,6 +1345,7 @@
+ 
+           let nextItem = this.ariaFocusableItems[newIndex];
+           let tabGroup = isTab(nextItem) && nextItem.group;
 +          if (gZenViewSplitter.handleTabDrop(event, urls, replace, inBackground)) return;
            gBrowser.loadTabs(urls, {
              inBackground,
              replace,
-@@ -1276,13 +1294,25 @@
+@@ -1357,6 +1376,16 @@
          return;
        }
  
--      this._finishMoveTogetherSelectedTabs(draggedTab);
-       this._finishAnimateTabMove();
- 
 +      if (!dt.mozUserCancelled && dt.dropEffect == "none" && !this._isCustomizing) {
 +        const moved = gZenViewSplitter.moveTabToSplitView(event, draggedTab);
 +        if (moved) {
@@ -118,18 +114,10 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
 +        if (gZenViewSplitter._lastOpenedTab) gZenViewSplitter._lastOpenedTab._visuallySelected = false;
 +      }
 +
-+      this._finishMoveTogetherSelectedTabs(draggedTab);
-+
-       if (
-         dt.mozUserCancelled ||
-         dt.dropEffect != "none" ||
--        this._isCustomizing
-+        this._isCustomizing ||
-+        draggedTab.pinned
-       ) {
-         delete draggedTab._dragData;
-         return;
-@@ -1504,7 +1534,7 @@
+       this.finishMoveTogetherSelectedTabs(draggedTab);
+       this.finishAnimateTabMove();
+       this.#expandGroupOnDrop(draggedTab);
+@@ -1582,7 +1611,7 @@
      }
  
      get newTabButton() {
@@ -138,7 +126,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
      }
  
      get verticalMode() {
-@@ -1524,29 +1554,41 @@
+@@ -1606,29 +1635,41 @@
        if (this.#allTabs) {
          return this.#allTabs;
        }
@@ -188,7 +176,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
      }
  
      /**
-@@ -1566,7 +1608,7 @@
+@@ -1648,7 +1689,7 @@
       */
      get visibleTabs() {
        if (!this.#visibleTabs) {
@@ -197,7 +185,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        }
        return this.#visibleTabs;
      }
-@@ -1601,23 +1643,18 @@
+@@ -1683,23 +1724,18 @@
        }
  
        let elementIndex = 0;
@@ -225,7 +213,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
              let visibleTabsInGroup = child.tabs.filter(tab => tab.visible);
              visibleTabsInGroup.forEach(tab => {
                tab.elementIndex = elementIndex++;
-@@ -1627,10 +1664,7 @@
+@@ -1709,10 +1745,7 @@
          }
        }
  
@@ -237,7 +225,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
  
        return this.#focusableItems;
      }
-@@ -1638,6 +1672,7 @@
+@@ -1720,6 +1753,7 @@
      _invalidateCachedTabs() {
        this.#allTabs = null;
        this._invalidateCachedVisibleTabs();
@@ -245,18 +233,18 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
      }
  
      _invalidateCachedVisibleTabs() {
-@@ -1652,8 +1687,8 @@
-     #isContainerVerticalPinnedExpanded(tab) {
+@@ -1734,8 +1768,8 @@
+     #isContainerVerticalPinnedGrid(tab) {
        return (
          this.verticalMode &&
 -        tab.hasAttribute("pinned") &&
--        this.hasAttribute("expanded")
+-        this.hasAttribute("expanded") &&
 +        (tab.hasAttribute("zen-essential")) &&
-+        (this.hasAttribute("expanded") || document.documentElement.hasAttribute("zen-sidebar-expanded"))
++        (this.hasAttribute("expanded") || document.documentElement.hasAttribute("zen-sidebar-expanded")) &&
+         !this.expandOnHover
        );
      }
- 
-@@ -1668,7 +1703,7 @@
+@@ -1751,7 +1785,7 @@
  
        if (node == null) {
          // We have a container for non-tab elements at the end of the scrollbox.
@@ -265,7 +253,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        }
  
        node.before(tab);
-@@ -1763,7 +1798,7 @@
+@@ -1846,7 +1880,7 @@
            // There are separate "new tab" buttons for horizontal tabs toolbar, vertical tabs and
            // for when the tab strip is overflowed (which is shared by vertical and horizontal tabs);
            // Attach the long click popup to all of them.
@@ -274,7 +262,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            const newTab2 = this.newTabButton;
            const newTabVertical = document.getElementById(
              "vertical-tabs-newtab-button"
-@@ -1846,7 +1881,7 @@
+@@ -1929,7 +1963,7 @@
            let rect = ele => {
              return window.windowUtils.getBoundsWithoutFlushing(ele);
            };
@@ -283,7 +271,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            if (tab && rect(tab).width <= this._tabClipWidth) {
              this.setAttribute("closebuttons", "activetab");
            } else {
-@@ -1858,10 +1893,12 @@
+@@ -1941,10 +1975,12 @@
  
      _handleTabSelect(aInstant) {
        let selectedTab = this.selectedItem;
@@ -296,34 +284,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        selectedTab._notselectedsinceload = false;
      }
  
-@@ -1873,7 +1910,7 @@
-         return;
-       }
- 
--      let tabs = this.visibleTabs;
-+      let tabs = this.visibleTabs.filter(tab => !tab.hasAttribute("zen-glance-tab"));
-       if (!tabs.length) {
-         return;
-       }
-@@ -1909,7 +1946,7 @@
-         if (isEndTab && !this._hasTabTempMaxWidth) {
-           return;
-         }
--        let numPinned = gBrowser.pinnedTabCount;
-+        let numPinned = gBrowser._numVisiblePinTabs;
-         // Force tabs to stay the same width, unless we're closing the last tab,
-         // which case we need to let them expand just enough so that the overall
-         // tabbar width is the same.
-@@ -1924,7 +1961,7 @@
-         let tabsToReset = [];
-         for (let i = numPinned; i < tabs.length; i++) {
-           let tab = tabs[i];
--          tab.style.setProperty("max-width", aTabWidth, "important");
-+          //tab.style.setProperty("max-width", aTabWidth, "important");
-           if (!isEndTab) {
-             // keep tabs the same width
-             tab.style.transition = "none";
-@@ -1990,16 +2027,15 @@
+@@ -2085,16 +2121,15 @@
        // Move pinned tabs to another container when the tabstrip is toggled to vertical
        // and when session restore code calls _positionPinnedTabs; update styling whenever
        // the number of pinned tabs changes.
@@ -346,7 +307,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          }
        }
  
-@@ -2007,9 +2043,7 @@
+@@ -2102,9 +2137,7 @@
      }
  
      _resetVerticalPinnedTabs() {
@@ -357,7 +318,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
  
        if (!verticalTabsContainer.children.length) {
          return;
-@@ -2022,8 +2056,8 @@
+@@ -2117,8 +2150,8 @@
      }
  
      _positionPinnedTabs() {
@@ -368,7 +329,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        let absPositionHorizontalTabs =
          this.overflowing && tabs.length > numPinned && numPinned > 0;
  
-@@ -2032,7 +2066,7 @@
+@@ -2127,7 +2160,7 @@
  
        if (this.verticalMode) {
          this._updateVerticalPinnedTabs();
@@ -377,7 +338,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          let layoutData = this._pinnedTabsLayoutCache;
          let uiDensity = document.documentElement.getAttribute("uidensity");
          if (!layoutData || layoutData.uiDensity != uiDensity) {
-@@ -2104,7 +2138,7 @@
+@@ -2191,7 +2224,7 @@
          return;
        }
  
@@ -386,7 +347,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
  
        let directionX = screenX > dragData.animLastScreenX;
        let directionY = screenY > dragData.animLastScreenY;
-@@ -2112,7 +2146,7 @@
+@@ -2199,7 +2232,7 @@
        dragData.animLastScreenX = screenX;
  
        let { width: tabWidth, height: tabHeight } =
@@ -395,7 +356,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        let shiftSizeX = tabWidth * movingTabs.length;
        let shiftSizeY = tabHeight;
        dragData.tabWidth = tabWidth;
-@@ -2296,11 +2330,15 @@
+@@ -2375,11 +2408,15 @@
        this.#clearDragOverCreateGroupTimer();
  
        let isPinned = draggedTab.pinned;
@@ -415,7 +376,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
  
        if (this.#rtlMode) {
          tabs.reverse();
-@@ -2314,7 +2352,7 @@
+@@ -2393,7 +2430,7 @@
        let size = this.verticalMode ? "height" : "width";
        let translateAxis = this.verticalMode ? "translateY" : "translateX";
        let scrollDirection = this.verticalMode ? "scrollTop" : "scrollLeft";
@@ -424,7 +385,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        let translateX = event.screenX - dragData.screenX;
        let translateY = event.screenY - dragData.screenY;
  
-@@ -2328,6 +2366,12 @@
+@@ -2407,6 +2444,12 @@
        let lastTab = tabs.at(-1);
        let lastMovingTab = movingTabs.at(-1);
        let firstMovingTab = movingTabs[0];
@@ -437,20 +398,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        let endEdge = ele => ele[screenAxis] + bounds(ele)[size];
        let lastMovingTabScreen = endEdge(lastMovingTab);
        let firstMovingTabScreen = firstMovingTab[screenAxis];
-@@ -2348,7 +2392,11 @@
-       translate = Math.min(Math.max(translate, firstBound), lastBound);
- 
-       for (let tab of movingTabs) {
--        tab.style.transform = `${translateAxis}(${translate}px)`;
-+        if (tab.group?.hasAttribute("split-view-group")) {
-+          tab.group.style.transform = `${translateAxis}(${translate}px)`;
-+        } else {
-+          tab.style.transform = `${translateAxis}(${translate}px)`;
-+        }
-       }
- 
-       dragData.translatePos = translate;
-@@ -2485,6 +2533,9 @@
+@@ -2568,6 +2611,9 @@
              break;
            }
            let element = tabs[mid];
@@ -460,7 +408,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            let elementForSize = isTabGroupLabel(element)
              ? element.parentElement
              : element;
-@@ -2507,6 +2558,10 @@
+@@ -2590,6 +2636,10 @@
        if (!dropElement) {
          dropElement = this.ariaFocusableItems[oldDropElementIndex];
        }
@@ -471,7 +419,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
        let newDropElementIndex = dropElement
          ? dropElement.elementIndex
          : oldDropElementIndex;
-@@ -2515,7 +2570,7 @@
+@@ -2598,7 +2648,7 @@
        let shouldCreateGroupOnDrop;
        let dropBefore;
        if (dropElement) {
@@ -480,11 +428,11 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            ? dropElement.parentElement
            : dropElement;
  
-@@ -2566,12 +2621,12 @@
+@@ -2660,12 +2710,12 @@
          }
        }
  
--      if (gBrowser._tabGroupsEnabled && !isPinned) {
+-      if (gBrowser._tabGroupsEnabled && isTab(draggedTab) && !isPinned) {
 +      if (true) {
          let dragOverGroupingThreshold = 1 - moveOverThreshold;
  
@@ -495,7 +443,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            dropElement != draggedTab &&
            isTab(dropElement) &&
            !dropElement?.group &&
-@@ -2639,7 +2694,7 @@
+@@ -2735,7 +2785,7 @@
        // Shift background tabs to leave a gap where the dragged tab
        // would currently be dropped.
        for (let item of tabs) {
@@ -504,7 +452,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            continue;
          }
  
-@@ -2648,6 +2703,9 @@
+@@ -2744,6 +2794,9 @@
          if (isTabGroupLabel(item)) {
            // Shift the `.tab-group-label-container` to shift the label element.
            item = item.parentElement;
@@ -514,19 +462,19 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          }
          item.style.transform = transform;
        }
-@@ -2697,8 +2755,9 @@
+@@ -2796,8 +2849,9 @@
        );
      }
  
--    _finishAnimateTabMove() {
--      if (!this.hasAttribute("movingtab")) {
-+    _finishAnimateTabMove(always = false) {
+-    finishAnimateTabMove() {
+-      if (!this.#isMovingTab()) {
++    finishAnimateTabMove(always = false) {
 +      gZenPinnedTabManager.removeTabContainersDragoverClass();
-+      if (!this.hasAttribute("movingtab") && !always) {
++      if (!this.#isMovingTab() && !always) {
          return;
        }
  
-@@ -2711,6 +2770,12 @@
+@@ -2809,6 +2863,12 @@
            item = item.parentElement;
          }
          item.style.transform = "";
@@ -539,7 +487,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
          item.removeAttribute("dragover-createGroup");
        }
        this.removeAttribute("movingtab-createGroup");
-@@ -2754,7 +2819,7 @@
+@@ -2855,7 +2915,7 @@
          let postTransitionCleanup = () => {
            movingTab._moveTogetherSelectedTabsData.animate = false;
          };
@@ -548,7 +496,7 @@ index 0fbdbf3aefc467880e6b0bae2615cb145735cb0f..75a30478387494c06e5c8131f55ba5dc
            postTransitionCleanup();
          } else {
            let onTransitionEnd = transitionendEvent => {
-@@ -2924,7 +2989,7 @@
+@@ -3028,7 +3088,7 @@
      }
  
      _notifyBackgroundTab(aTab) {
diff --git a/src/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection-jsx.patch b/src/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection-jsx.patch
deleted file mode 100644
index f92d7c824..000000000
--- a/src/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection-jsx.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection.jsx b/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection.jsx
-index dcf192d0ab7323d69f1bf505971e57c98ad4397d..a4d88304786af35030391f71bc99eee6cf7c1a64 100644
---- a/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection.jsx
-+++ b/browser/extensions/newtab/content-src/components/CustomizeMenu/ContentSection/ContentSection.jsx
-@@ -188,7 +188,7 @@ export class ContentSection extends React.PureComponent {
-                         data-l10n-args='{"num": 4}'
-                       />
-                     </select>
--                    {mayHaveSponsoredTopSites && (
-+                    {false && (
-                       <div className="check-wrapper" role="presentation">
-                         <input
-                           id="sponsored-shortcuts"
diff --git a/src/browser/themes/shared/tabbrowser/tabs-css.patch b/src/browser/themes/shared/tabbrowser/tabs-css.patch
index e84a8ef9a..a89f5c49c 100644
--- a/src/browser/themes/shared/tabbrowser/tabs-css.patch
+++ b/src/browser/themes/shared/tabbrowser/tabs-css.patch
@@ -1,5 +1,5 @@
 diff --git a/browser/themes/shared/tabbrowser/tabs.css b/browser/themes/shared/tabbrowser/tabs.css
-index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52c16c5227 100644
+index f03eb840f363c01a0ab304659795b51f4f61a866..24a0c0cc573e27776843925b83cc919fa546aeb9 100644
 --- a/browser/themes/shared/tabbrowser/tabs.css
 +++ b/browser/themes/shared/tabbrowser/tabs.css
 @@ -32,7 +32,7 @@
@@ -11,7 +11,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
    --tab-hover-background-color: color-mix(in srgb, currentColor 11%, transparent);
    --tab-selected-textcolor: var(--toolbar-color);
    --tab-selected-bgcolor: var(--toolbar-bgcolor);
-@@ -214,8 +214,7 @@
+@@ -210,8 +210,7 @@
    }
  
    #tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > &[pinned] {
@@ -20,16 +20,16 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
 +
    }
  
-   #tabbrowser-tabs[movingtab] &:is([selected], [multiselected]) {
-@@ -254,7 +253,6 @@
+   #tabbrowser-tabs[movingtab] &:is(:active, [multiselected]) {
+@@ -257,7 +256,6 @@
    }
  
-   :root:not([uidensity=compact]) &[pinned] {
+   :root:not([uidensity=compact], [sidebar-expand-on-hover]) &[pinned] {
 -    padding: 0 10px;
    }
  
    &:is([selected], [multiselected]) {
-@@ -268,6 +266,7 @@
+@@ -271,6 +269,7 @@
      border-radius: inherit;
      position: relative;
      overflow: hidden;
@@ -37,7 +37,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
  
      &::before {
        position: absolute;
-@@ -442,6 +441,7 @@
+@@ -458,6 +457,7 @@
  .tab-icon-image {
    -moz-context-properties: fill, stroke;
    fill: currentColor;
@@ -45,7 +45,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
  
    /* Apply crisp rendering for favicons at exactly 2dppx resolution */
    @media (resolution: 2dppx) {
-@@ -523,7 +523,7 @@
+@@ -557,7 +557,7 @@
    z-index: 1; /* Overlay tab title */
  
    #tabbrowser-tabs[orient=vertical] & {
@@ -54,7 +54,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
    }
  
    &[crashed] {
-@@ -531,7 +531,7 @@
+@@ -565,7 +565,7 @@
    }
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) &:not([crashed]),
@@ -63,7 +63,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
      &[soundplaying] {
        list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-playing-small.svg");
      }
-@@ -561,7 +561,7 @@
+@@ -595,7 +595,7 @@
        background-image: linear-gradient(var(--audio-overlay-extra-background)),
                          linear-gradient(var(--toolbox-bgcolor));
        -moz-context-properties: fill;
@@ -72,44 +72,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
        color-scheme: var(--tab-selected-color-scheme);
        border-radius: var(--border-radius-circle);
  
-@@ -593,7 +593,7 @@
-   }
- 
-   #tabbrowser-tabs[orient="vertical"]:not([expanded]) &:is([soundplaying], [muted], [activemedia-blocked]),
--  &[pinned]:is([soundplaying], [muted], [activemedia-blocked]),
-+  &:is([soundplaying], [muted], [activemedia-blocked]),
-   &[crashed] {
-     display: revert;
-   }
-@@ -607,7 +607,7 @@
-   --button-min-height-small: 24px;
-   --button-border-radius: var(--border-radius-small);
- 
--  #tabbrowser-tabs:is([orient="vertical"][expanded], [orient="horizontal"]) &:not([pinned]):not([crashed]) {
-+  #tabbrowser-tabs:is([orient="horizontal"]) &:not([pinned]):not([crashed]) {
-     &:is([soundplaying], [muted], [activemedia-blocked]) {
-       display: block;
-     }
-@@ -638,14 +638,14 @@
-   }
- 
-   &[textoverflow] {
--    &[labeldirection=ltr]:not([pinned]),
--    &:not([labeldirection], [pinned]):-moz-locale-dir(ltr) {
-+    &[labeldirection=ltr],
-+    &:not([labeldirection]):-moz-locale-dir(ltr) {
-       direction: ltr;
-       mask-image: linear-gradient(to left, transparent, black var(--tab-label-mask-size));
-     }
- 
--    &[labeldirection=rtl]:not([pinned]),
--    &:not([labeldirection], [pinned]):-moz-locale-dir(rtl) {
-+    &[labeldirection=rtl],
-+    &:not([labeldirection]):-moz-locale-dir(rtl) {
-       direction: rtl;
-       mask-image: linear-gradient(to right, transparent, black var(--tab-label-mask-size));
-     }
-@@ -1201,7 +1201,7 @@
+@@ -1362,7 +1362,7 @@ tab-group {
    }
  }
  
@@ -118,7 +81,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
  #vertical-tabs-newtab-button {
    appearance: none;
    min-height: var(--tab-min-height);
-@@ -1212,7 +1212,7 @@
+@@ -1373,7 +1373,7 @@ tab-group {
    margin-inline: var(--tab-inner-inline-margin);
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) & > .toolbarbutton-text {
@@ -127,7 +90,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
    }
  
    &:hover {
-@@ -1236,7 +1236,7 @@
+@@ -1397,7 +1397,7 @@ tab-group {
   * flex container. #tabs-newtab-button is a child of the arrowscrollbox where
   * we don't want a gap (between tabs), so we have to add some margin.
   */
@@ -136,15 +99,16 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
    margin-block: var(--tab-block-margin);
  }
  
-@@ -1260,7 +1260,6 @@
- }
+@@ -1471,8 +1471,6 @@ tab-group {
+   }
  
- #vertical-pinned-tabs-container {
--  --tab-inline-padding: calc((calc(var(--tab-collapsed-background-width) + 2 * var(--tab-pinned-margin-inline-expanded) - var(--icon-size-default)) / 2));
-   display: none;
-   grid-template-columns: repeat(auto-fit, minmax(var(--tab-pinned-min-width-expanded), auto));
-   overflow-y: auto;
-@@ -1480,7 +1479,7 @@
+   :root:not([sidebar-expand-on-hover]) & {
+-    --tab-inline-padding: calc((var(--tab-collapsed-background-width) + 2 *
+-      var(--tab-pinned-margin-inline-expanded) - var(--icon-size-default)) / 2);
+     /* stylelint-disable-next-line media-query-no-invalid */
+     @media not -moz-pref("sidebar.visibility", "expand-on-hover") {
+       /* We need these rules to apply at all times when the sidebar.visibility
+@@ -1717,7 +1715,7 @@ tab-group {
    toolbarbutton:not(#firefox-view-button),
    toolbarpaletteitem:not(#wrapper-firefox-view-button)
  ) ~ #tabbrowser-tabs {
@@ -153,7 +117,7 @@ index bafbb39aac37843e3b6dceb0e81304af51e186cc..92b4fd725118150634ab2ae0a24efb52
    padding-inline-start: calc(var(--tab-overflow-pinned-tabs-width) + 2px);
    margin-inline-start: 2px;
  }
-@@ -1514,7 +1513,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
+@@ -1751,7 +1749,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
    list-style-image: url(chrome://global/skin/icons/plus.svg);
  }
  
diff --git a/src/browser/themes/windows/browser-css.patch b/src/browser/themes/windows/browser-css.patch
index f7251386e..e75b753be 100644
--- a/src/browser/themes/windows/browser-css.patch
+++ b/src/browser/themes/windows/browser-css.patch
@@ -1,20 +1,13 @@
 diff --git a/browser/themes/windows/browser.css b/browser/themes/windows/browser.css
-index 9af78803f0005a2b89e1c73f52153ed4d9e3154a..b63dc3d050144f048ac6a326acd57cc85fa8a3a7 100644
+index 3e75a5f366e76acf4b9457a510b58b0cb8af580f..4962151f34ff52e8d009b82a9a12da99c4745a7a 100644
 --- a/browser/themes/windows/browser.css
 +++ b/browser/themes/windows/browser.css
-@@ -40,14 +40,13 @@
-          * override these on the tabs toolbar because the accent color is
-          * arbitrary, so the hardcoded colors from browser-custom-colors might
-          * not provide sufficient contrast. */
--        --toolbarbutton-icon-fill: currentColor;
-         --toolbarbutton-hover-background: color-mix(in srgb, currentColor 17%, transparent);
-         --toolbarbutton-active-background: color-mix(in srgb, currentColor 30%, transparent);
+@@ -57,7 +57,7 @@
        }
      }
  
-     &[sizemode="normal"] #navigator-toolbox {
--      border-top: .5px solid ActiveBorder;
-+      /* border-top: .5px solid ActiveBorder; Zen: Remove annoying top border, dont remove */
+-    &[sizemode="normal"] #navigator-toolbox {
++    &[sizemode="normal"] #browser {
+       border-top: .5px solid ActiveBorder;
        &:-moz-window-inactive {
          border-top-color: InactiveBorder;
-       }
diff --git a/src/modules/libpref/init/zen-static-prefs.inc b/src/modules/libpref/init/zen-static-prefs.inc
index b53d20ae2..2761dbb22 100644
--- a/src/modules/libpref/init/zen-static-prefs.inc
+++ b/src/modules/libpref/init/zen-static-prefs.inc
@@ -11,10 +11,3 @@
   value: 1
   mirror: always
 #endif
-
-#ifdef XP_WIN
-- name: zen.widget.windows.acrylic
-  type: bool
-  value: true
-  mirror: always
-#endif
diff --git a/src/toolkit/content/aboutSupport-xhtml.patch b/src/toolkit/content/aboutSupport-xhtml.patch
index 61b7b7b0b..b2bd09de8 100644
--- a/src/toolkit/content/aboutSupport-xhtml.patch
+++ b/src/toolkit/content/aboutSupport-xhtml.patch
@@ -1,12 +1,12 @@
 diff --git a/toolkit/content/aboutSupport.xhtml b/toolkit/content/aboutSupport.xhtml
-index 05e3d72a6e67900e9b3d9bfd35c89b056c7ca747..55408e77830492765c976dd967ca14a7b74cba97 100644
+index 296259cd0360a403e8659e22d0c08e968529a38a..bde1ee8d0a05e6ce2eb3ff8ff8a19ba28c20af98 100644
 --- a/toolkit/content/aboutSupport.xhtml
 +++ b/toolkit/content/aboutSupport.xhtml
-@@ -31,6 +31,7 @@
- #ifndef ANDROID
-     <link rel="localization" href="toolkit/featuregates/features.ftl"/>
- #endif
-+    <script src="chrome://browser/content/zenThemeModifier.js"></script>
-   </head>
+@@ -10,6 +10,7 @@
  
-   <body class="wide-container">
+ <html xmlns="http://www.w3.org/1999/xhtml">
+   <head>
++    <script src="chrome://browser/content/zenThemeModifier.js"></script>
+     <meta http-equiv="Content-Security-Policy" content="default-src chrome:; object-src 'none'" />
+     <meta name="color-scheme" content="light dark" />
+     <title data-l10n-id="page-title"/>
diff --git a/src/toolkit/mozapps/extensions/internal/XPIProvider-sys-mjs.patch b/src/toolkit/mozapps/extensions/internal/XPIProvider-sys-mjs.patch
index 8bb6cf4ce..f916df9de 100644
--- a/src/toolkit/mozapps/extensions/internal/XPIProvider-sys-mjs.patch
+++ b/src/toolkit/mozapps/extensions/internal/XPIProvider-sys-mjs.patch
@@ -1,15 +1,15 @@
 diff --git a/toolkit/mozapps/extensions/internal/XPIProvider.sys.mjs b/toolkit/mozapps/extensions/internal/XPIProvider.sys.mjs
-index 3af9a7779dd43a6ded906ceaf6768c56d53c8605..c0b597fa3f8073b9bfb4118d5352246a5b54c2d7 100644
+index 2cafde2156680a557081c5b82923f14618749358..0f4f5160f649165df80f35fbe72e02786a5b867e 100644
 --- a/toolkit/mozapps/extensions/internal/XPIProvider.sys.mjs
 +++ b/toolkit/mozapps/extensions/internal/XPIProvider.sys.mjs
-@@ -2556,8 +2556,8 @@ export var XPIProvider = {
+@@ -2674,8 +2674,8 @@ export var XPIProvider = {
+       if (AppConstants.platform != "android") {
+         // Keep version in sync with toolkit/mozapps/extensions/default-theme/manifest.json
+         this.maybeInstallBuiltinAddon(
+-          "default-theme@mozilla.org",
+-          "1.4.1",
++          "firefox-compact-dark@mozilla.org",
++          "1.3",
+           "resource://default-theme/"
+         );
        }
-       // Keep version in sync with toolkit/mozapps/extensions/default-theme/manifest.json
-       this.maybeInstallBuiltinAddon(
--        "default-theme@mozilla.org",
--        "1.4.1",
-+        "firefox-compact-dark@mozilla.org",
-+        "1.3",
-         "resource://default-theme/"
-       );
- 
diff --git a/src/toolkit/themes/shared/popup-css.patch b/src/toolkit/themes/shared/popup-css.patch
index f5e674f12..b5db33881 100644
--- a/src/toolkit/themes/shared/popup-css.patch
+++ b/src/toolkit/themes/shared/popup-css.patch
@@ -1,32 +1,15 @@
 diff --git a/toolkit/themes/shared/popup.css b/toolkit/themes/shared/popup.css
-index ed0caa97db5726a7d1bc1cd0aa7af3fdf99690dc..ce49d7f6900a1184c9aed00c26bd7b42916482aa 100644
+index 5701d305fdfc0407ead51aa52eefee38e7429de8..642325e981e9597eaaefefa725852a49b49ee6dc 100644
 --- a/toolkit/themes/shared/popup.css
 +++ b/toolkit/themes/shared/popup.css
-@@ -21,8 +21,8 @@ panel {
+@@ -22,8 +22,8 @@ panel {
    --panel-border-color: ThreeDShadow;
    --panel-width: initial;
  
--  --panel-shadow-margin: 0px;
+-  --panel-shadow-margin: 4px;
 -  --panel-shadow: 0 0 var(--panel-shadow-margin) hsla(0,0%,0%,.2);
 +  --panel-shadow-margin: 10px;
 +  --panel-shadow: var(--zen-big-shadow);
    -moz-window-input-region-margin: var(--panel-shadow-margin);
    margin: calc(-1 * var(--panel-shadow-margin));
  
-@@ -30,8 +30,6 @@ panel {
-   --background-color-canvas: var(--panel-background);
- 
-   @media (-moz-platform: linux) {
--    --panel-border-radius: 8px;
--    --panel-padding-block: 3px;
- 
-     @media (prefers-contrast) {
-       --panel-border-color: color-mix(in srgb, currentColor 60%, transparent);
-@@ -208,7 +206,6 @@ panel:where([type="arrow"]) {
-     }
- 
-     &[animating] {
--      pointer-events: none;
-     }
-   }
- }
diff --git a/src/widget/windows/WinUtils-cpp.patch b/src/widget/windows/WinUtils-cpp.patch
deleted file mode 100644
index 2d3854274..000000000
--- a/src/widget/windows/WinUtils-cpp.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff --git a/widget/windows/WinUtils.cpp b/widget/windows/WinUtils.cpp
-index 598c96cbb5cd06a986a5793ebe9c5438d419d4a9..de1317749e6a6dd7df644818970d7706a51e6c14 100644
---- a/widget/windows/WinUtils.cpp
-+++ b/widget/windows/WinUtils.cpp
-@@ -2007,6 +2007,7 @@ bool WinUtils::GetTimezoneName(wchar_t* aBuffer) {
- static constexpr nsLiteralCString kMicaPrefs[] = {
-     "widget.windows.mica"_ns,
-     "widget.windows.mica.popups"_ns,
-+    "zen.widget.windows.acrylic"_ns,
- };
- 
- static BOOL CALLBACK UpdateMicaInHwnd(HWND aHwnd, LPARAM aLParam) {
diff --git a/src/widget/windows/nsWindow-cpp.patch b/src/widget/windows/nsWindow-cpp.patch
deleted file mode 100644
index 0de755b0a..000000000
--- a/src/widget/windows/nsWindow-cpp.patch
+++ /dev/null
@@ -1,21 +0,0 @@
-diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
-index d2863d5fd9ce5cedc88253a07cb061a660d42e61..5c1097ad16cd6e27e76cc6dfbed85218d36cc36f 100644
---- a/widget/windows/nsWindow.cpp
-+++ b/widget/windows/nsWindow.cpp
-@@ -165,6 +165,7 @@
- #include "mozilla/StaticPrefs_layout.h"
- #include "mozilla/StaticPrefs_ui.h"
- #include "mozilla/StaticPrefs_widget.h"
-+#include "mozilla/StaticPrefs_zen.h"
- #include "nsNativeAppSupportWin.h"
- 
- #include "nsIGfxInfo.h"
-@@ -2546,7 +2547,7 @@ void nsWindow::UpdateMicaBackdrop(bool aForce) {
-     if (!useBackdrop) {
-       return DWMSBT_AUTO;
-     }
--    return IsPopup() ? DWMSBT_TRANSIENTWINDOW : DWMSBT_TABBEDWINDOW;
-+    return IsPopup() ? DWMSBT_TRANSIENTWINDOW : (StaticPrefs::zen_widget_windows_acrylic() ? DWMSBT_TRANSIENTWINDOW : DWMSBT_TABBEDWINDOW);
-   }();
-   ::DwmSetWindowAttribute(mWnd, DWMWA_SYSTEMBACKDROP_TYPE, &backdrop,
-                           sizeof backdrop);
diff --git a/src/zen/common/ZenUIMigration.mjs b/src/zen/common/ZenUIMigration.mjs
index 90e1eea5b..6490344d7 100644
--- a/src/zen/common/ZenUIMigration.mjs
+++ b/src/zen/common/ZenUIMigration.mjs
@@ -6,7 +6,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
 
 class ZenUIMigration {
   PREF_NAME = 'zen.migration.version';
-  MIGRATION_VERSION = 1;
+  MIGRATION_VERSION = 2;
 
   init(isNewProfile, win) {
     if (!isNewProfile) {
@@ -27,13 +27,16 @@ class ZenUIMigration {
     if (this._migrationVersion < 1) {
       this._migrateV1(win);
     }
+    if (this._migrationVersion < 2) {
+      this._migrateV2(win);
+    }
   }
 
   clearVariables() {
     this._migrationVersion = this.MIGRATION_VERSION;
   }
 
-  async _migrateV1(win) {
+  _migrateV1(win) {
     // Introduction of the new URL bar, show a message to the user
     const notification = win.gNotificationBox.appendNotification(
       'zen-new-urlbar-notification',
@@ -57,6 +60,13 @@ class ZenUIMigration {
       ]
     );
   }
+
+  _migrateV2(win) {
+    if (Services.prefs.getBoolPref('zen.widget.windows.acrylic', false)) {
+      Services.prefs.setIntPref('widget.windows.mica.toplevel-backdrop', 2);
+      Services.prefs.clearUserPref('zen.widget.windows.acrylic');
+    }
+  }
 }
 
 export var gZenUIMigration = new ZenUIMigration();
diff --git a/src/zen/common/styles/zen-theme.css b/src/zen/common/styles/zen-theme.css
index b16cfcf3e..f85cb0078 100644
--- a/src/zen/common/styles/zen-theme.css
+++ b/src/zen/common/styles/zen-theme.css
@@ -163,7 +163,7 @@
   @media (-moz-windows-mica) or (-moz-platform: macos) {
     background: transparent;
     --zen-themed-toolbar-bg-transparent: transparent;
-    @media -moz-pref('zen.widget.windows.acrylic') {
+    @media -moz-pref("widget.windows.mica.toplevel-backdrop", 2) {
       --zen-themed-toolbar-bg-transparent: color-mix(in srgb, var(--zen-themed-toolbar-bg) 35%, transparent 65%);
     }
   }
diff --git a/src/zen/split-view/ZenViewSplitter.mjs b/src/zen/split-view/ZenViewSplitter.mjs
index efb90d7c2..25c2e3320 100644
--- a/src/zen/split-view/ZenViewSplitter.mjs
+++ b/src/zen/split-view/ZenViewSplitter.mjs
@@ -187,7 +187,7 @@ class ZenViewSplitter extends ZenDOMOperatedFeature {
       if (!draggedTab || gBrowser.selectedTab.hasAttribute('zen-empty-tab')) {
         return;
       }
-      draggedTab.container._finishMoveTogetherSelectedTabs(draggedTab);
+      draggedTab.container.finishMoveTogetherSelectedTabs(draggedTab);
     }
     if (
       !draggedTab ||
diff --git a/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css b/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
index 8a4280a06..b24a57a2f 100644
--- a/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
+++ b/src/zen/tabs/zen-tabs/vertical-tabs-topbar.inc.css
@@ -16,7 +16,7 @@ z-index: 1;
 
   &:not([zen-has-hover='true']):not([has-popup-menu]):not(:focus-within):not(:has(*:is([panelopen='true'], [open='true']))) {
     transition-delay: 0.2s;
-    height: calc(var(--zen-element-separation) + 0.5px);
+    height: var(--zen-element-separation);
     overflow: hidden;
     opacity: 0;
     & > * {