diff --git a/browser/components/urlbar/UrlbarInput.sys.mjs b/browser/components/urlbar/UrlbarInput.sys.mjs
index afc7a6c6ddbf4cf5a5b27c0bd60577b833c63093..77955d888e70409c83b217e676e1575417018831 100644
--- a/browser/components/urlbar/UrlbarInput.sys.mjs
+++ b/browser/components/urlbar/UrlbarInput.sys.mjs
@@ -76,6 +76,13 @@ ChromeUtils.defineLazyGetter(lazy, "logger", () =>
   lazy.UrlbarUtils.getLogger({ prefix: "Input" })
 );
 
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "ZEN_URLBAR_BEHAVIOR",
+  "zen.urlbar.behavior",
+  'default'
+);
+
 const DEFAULT_FORM_HISTORY_NAME = "searchbar-history";
 
 const UNLIMITED_MAX_RESULTS = 99;
@@ -437,7 +444,16 @@ export class UrlbarInput {
     // See _on_select().  HTMLInputElement.select() dispatches a "select"
     // event but does not set the primary selection.
     this._suppressPrimaryAdjustment = true;
+    const zenToolbox = this.document.getElementById("navigator-toolbox");
+    this.window.document.documentElement.setAttribute("supress-primary-adjustment", !(
+      zenToolbox.hasAttribute("zen-has-hover") ||
+      zenToolbox.hasAttribute("zen-has-empty-tab") ||
+      zenToolbox.hasAttribute("zen-user-show")
+    ));
     this.inputField.select();
+    this.document.ownerGlobal.setTimeout(() => {
+      this.window.document.documentElement.removeAttribute("supress-primary-adjustment");
+    }, 0);
     this._suppressPrimaryAdjustment = false;
   }
 
@@ -513,6 +529,10 @@ export class UrlbarInput {
     hideSearchTerms = false,
     isSameDocument = false
   ) {
+    if (this.hasAttribute("zen-newtab")) {
+      return;
+    }
+
     if (!this.isAddressbar) {
       throw new Error(
         "Cannot set URI for UrlbarInput that is not an address bar"
@@ -790,8 +810,16 @@ export class UrlbarInput {
         return;
       }
     }
-
+    const zenToolbox = this.document.getElementById("navigator-toolbox");
+    this.window.document.documentElement.setAttribute("supress-primary-adjustment", !(
+      zenToolbox.hasAttribute("zen-has-hover") ||
+      zenToolbox.hasAttribute("zen-has-empty-tab") ||
+      zenToolbox.hasAttribute("zen-user-show")
+    ));
     this.handleNavigation({ event });
+    this.document.ownerGlobal.setTimeout(() => {
+      this.window.document.documentElement.removeAttribute("supress-primary-adjustment");
+    }, 100);
   }
 
   /**
@@ -1207,7 +1235,11 @@ export class UrlbarInput {
     }
 
     if (!this.#providesSearchMode(result)) {
-      this.view.close({ elementPicked: true });
+      if (this._zenHandleUrlbarClose) {
+        this._zenHandleUrlbarClose(true, true);
+      } else {
+        this.window.setTimeout(() => this.view.close({ elementPicked: true }), 0);
+      }
     }
 
     if (isCanonized) {
@@ -2298,6 +2330,17 @@ export class UrlbarInput {
     await this.#updateLayoutBreakoutDimensions();
   }
 
+  zenFormatURLValue() {
+    return this.#lazy.valueFormatter._formatURL();
+  }
+
+  get zenUrlbarBehavior() {
+    if (this.document.documentElement.hasAttribute("inDOMFullscreen")) {
+      return "float";
+    }
+    return lazy.ZEN_URLBAR_BEHAVIOR;
+  }
+
   startLayoutExtend() {
     if (!this.#allowBreakout || this.hasAttribute("breakout-extend")) {
       // Do not expand if the Urlbar does not support being expanded or it is
@@ -2312,6 +2355,12 @@ export class UrlbarInput {
 
     this.setAttribute("breakout-extend", "true");
 
+    if (this.zenUrlbarBehavior == 'float' || (this.zenUrlbarBehavior == 'floating-on-type' && !this.focusedViaMousedown)) {
+      this.setAttribute("zen-floating-urlbar", "true");
+      this.window.gZenUIManager.onFloatingURLBarOpen();
+    } else {
+      this.removeAttribute("zen-floating-urlbar");
+    }
     // Enable the animation only after the first extend call to ensure it
     // doesn't run when opening a new window.
     if (!this.hasAttribute("breakout-extend-animate")) {
@@ -2331,6 +2380,24 @@ export class UrlbarInput {
       return;
     }
 
+    if (this._zenHandleUrlbarClose) {
+      this._zenHandleUrlbarClose();
+    }
+    
+    // Arc like URLbar: Blur the input on exit
+    const zenToolbox = this.document.getElementById("navigator-toolbox");
+    this.window.document.documentElement.setAttribute("supress-primary-adjustment", !(
+      zenToolbox.hasAttribute("zen-has-hover") ||
+      zenToolbox.hasAttribute("zen-has-empty-tab") ||
+      zenToolbox.hasAttribute("zen-user-show")
+    ));
+    this.window.gBrowser.selectedBrowser.focus();
+    this.document.ownerGlobal.setTimeout(() => {
+      this.window.document.documentElement.removeAttribute("supress-primary-adjustment");
+    }, 100);
+    
+    this.removeAttribute("zen-floating-urlbar");
+
     this.removeAttribute("breakout-extend");
     this.#updateTextboxPosition();
   }
@@ -2660,7 +2727,7 @@ export class UrlbarInput {
 
         this.textbox.parentNode.style.setProperty(
           "--urlbar-container-height",
-          px(getBoundsWithoutFlushing(this.textbox.parentNode).height)
+          px(getBoundsWithoutFlushing(this.textbox.parentNode).height + 8)
         );
         this.textbox.style.setProperty(
           "--urlbar-height",
@@ -3093,6 +3160,7 @@ export class UrlbarInput {
   }
 
   _toggleActionOverride(event) {
+    if (!Services.prefs.getBoolPref("zen.urlbar.enable-overrides")) return;
     if (
       event.keyCode == KeyEvent.DOM_VK_SHIFT ||
       event.keyCode == KeyEvent.DOM_VK_ALT ||
@@ -3197,7 +3265,7 @@ export class UrlbarInput {
       return val;
     }
     let trimmedValue = lazy.UrlbarPrefs.get("trimURLs")
-      ? lazy.BrowserUIUtils.trimURL(val)
+      ? this._zenTrimURL(val)
       : val;
     // Only trim value if the directionality doesn't change to RTL and we're not
     // showing a strikeout https protocol.
@@ -3407,6 +3475,7 @@ export class UrlbarInput {
       );
     }
 
+    openUILinkWhere = this.window.gZenUIManager.getOpenUILinkWhere(url, browser, openUILinkWhere);
     // No point in setting these because we'll handleRevert() a few rows below.
     if (openUILinkWhere == "current") {
       // Make sure URL is formatted properly (don't show punycode).
@@ -3608,6 +3677,10 @@ export class UrlbarInput {
       }
       reuseEmpty = true;
     }
+    if (this.hasAttribute("zen-newtab")) {
+      where = "tab";
+      reuseEmpty = true;
+    }
     if (
       where == "tab" &&
       reuseEmpty &&
@@ -3615,6 +3688,9 @@ export class UrlbarInput {
     ) {
       where = "current";
     }
+    if (this.window.gBrowser.selectedTab.hasAttribute("zen-empty-tab")) {
+      return "tab"; // Always open in a new tab if the current tab is "our empty tab".
+    }
     return where;
   }
 
@@ -3872,6 +3948,7 @@ export class UrlbarInput {
       this.setResultForCurrentValue(null);
       this.handleCommand();
       this.controller.clearLastQueryContextCache();
+      this.view.close();
 
       this._suppressStartQuery = false;
     });
@@ -3879,7 +3956,6 @@ export class UrlbarInput {
     contextMenu.addEventListener("popupshowing", () => {
       // Close the results pane when the input field contextual menu is open,
       // because paste and go doesn't want a result selection.
-      this.view.close();
 
       let controller =
         this.document.commandDispatcher.getControllerForCommand("cmd_paste");
@@ -3991,7 +4067,11 @@ export class UrlbarInput {
     if (!engineName && !source && !this.hasAttribute("searchmode")) {
       return;
     }
-
+    this.window.dispatchEvent(
+      new CustomEvent("Zen:UrlbarSearchModeChanged", {
+        detail: { searchMode },
+      })
+    );
     if (this._searchModeIndicatorTitle) {
       this._searchModeIndicatorTitle.textContent = "";
       this._searchModeIndicatorTitle.removeAttribute("data-l10n-id");
@@ -4302,6 +4382,7 @@ export class UrlbarInput {
 
     this.document.l10n.setAttributes(
       this.inputField,
+      this.window.gZenVerticalTabsManager._hasSetSingleToolbar ? 'zen-singletoolbar-urlbar-placeholder-with-name' :
       l10nId,
       l10nId == "urlbar-placeholder-with-name" ? { name } : undefined
     );
@@ -4413,6 +4494,11 @@ export class UrlbarInput {
   }
 
   _on_click(event) {
+    if (event.target == this.inputField) {
+      event.zenOriginalTarget = this.textbox;
+      this._on_mousedown(event);
+    }
+
     if (
       event.target == this.inputField ||
       event.target == this._inputContainer
@@ -4485,7 +4571,7 @@ export class UrlbarInput {
       }
     }
 
-    if (this.focusedViaMousedown) {
+    if (this.focusedViaMousedown || this.hasAttribute("zen-newtab")) {
       this.view.autoOpen({ event });
     } else {
       if (this._untrimOnFocusAfterKeydown) {
@@ -4525,9 +4611,16 @@ export class UrlbarInput {
   }
 
   _on_mousedown(event) {
-    switch (event.currentTarget) {
+    switch (event.zenOriginalTarget || event.currentTarget) {
       case this.textbox: {
         this._mousedownOnUrlbarDescendant = true;
+        const isProbablyFloating =
+          (this.zenUrlbarBehavior == "floating-on-type" &&
+          this.hasAttribute("breakout-extend") && !this.focusedViaMousedown) ||
+          (this.zenUrlbarBehavior == "float") || this.window.gZenVerticalTabsManager._hasSetSingleToolbar;
+        if (event.type != "click" && isProbablyFloating || event.type == "click" && !isProbablyFloating) {
+          return true;
+        }
 
         if (
           event.target != this.inputField &&
@@ -4538,6 +4631,10 @@ export class UrlbarInput {
 
         this.focusedViaMousedown = !this.focused;
         this._preventClickSelectsAll = this.focused;
+        if (isProbablyFloating) {
+          this.focusedViaMousedown = !this.hasAttribute("breakout-extend");
+          this._preventClickSelectsAll = this.hasAttribute("breakout-extend");
+        }
 
         // Keep the focus status, since the attribute may be changed
         // upon calling this.focus().
@@ -4573,7 +4670,7 @@ export class UrlbarInput {
         }
         // Don't close the view when clicking on a tab; we may want to keep the
         // view open on tab switch, and the TabSelect event arrived earlier.
-        if (event.target.closest("tab")) {
+        if (event.target.closest("tab") || event.target.closest("#tabs-newtab-button")) {
           break;
         }
 
@@ -4890,7 +4987,7 @@ export class UrlbarInput {
     // When we are in actions search mode we can show more results so
     // increase the limit.
     let maxResults =
-      this.searchMode?.source != lazy.UrlbarUtils.RESULT_SOURCE.ACTIONS
+      this.searchMode?.source != lazy.UrlbarUtils.RESULT_SOURCE.ZEN_ACTIONS
         ? lazy.UrlbarPrefs.get("maxRichResults")
         : UNLIMITED_MAX_RESULTS;
     let options = {