diff --git a/src/browser/base/content/ZenStartup.mjs b/src/browser/base/content/ZenStartup.mjs
index 18f255708..b1ad3e4d0 100644
--- a/src/browser/base/content/ZenStartup.mjs
+++ b/src/browser/base/content/ZenStartup.mjs
@@ -202,11 +202,11 @@
         const defaultSidebarIcons = [
           'zen-sidepanel-button',
           'zen-workspaces-button',
-          'vertical-tabs-newtab-button'
+          'new-tab-button'
         ];
         for (let id of defaultSidebarIcons) {
-          if (id === 'zen-workspaces-button') continue;
           const elem = document.getElementById(id);
+          if (id === 'zen-workspaces-button' || !elem) continue;
           elem.setAttribute('removable', 'true');
         }
         CustomizableUI.registerArea(
diff --git a/src/browser/base/content/zen-styles/zen-browser-ui.css b/src/browser/base/content/zen-styles/zen-browser-ui.css
index f519af8b8..87ada467a 100644
--- a/src/browser/base/content/zen-styles/zen-browser-ui.css
+++ b/src/browser/base/content/zen-styles/zen-browser-ui.css
@@ -35,6 +35,7 @@
 
 :not([inDOMFullscreen='true']) #appcontent {
   overflow: hidden;
+  padding: 1px;
 }
 
 :not([inDOMFullscreen='true']) #appcontent,
diff --git a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
index eefe9251a..1b45489e7 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
@@ -34,7 +34,6 @@
     padding-top: var(--zen-toolbox-top-align);
     padding-bottom: var(--zen-element-separation);
 
-    margin-top: -4px !important;
     display: flex;
   }
 
@@ -530,12 +529,15 @@
     display: none;
   }*/
 
-  :root[customizing] #TabsToolbar > * {
+  :root[customizing] #TabsToolbar > *,
+  :root[customizing] #TabsToolbar-customization-target {
     min-width: unset !important;
   }
 
   /* Mark: Sidebar top buttons */
   #zen-sidebar-top-buttons {
+    order: -1;
+
     min-width: unset !important;
     --toolbarbutton-inner-padding: var(--zen-toolbar-button-inner-padding) !important;
     
@@ -544,7 +546,11 @@
       align-items: center;
 
       #nav-bar:has(&) & {
-        padding-inline-start: calc(var(--zen-toolbox-padding) + var(--toolbarbutton-outer-padding)) !important;
+        padding-inline-start: calc(var(--zen-toolbox-padding) + 2px);
+      }
+
+      #browser:has(#navigator-toolbox[zen-right-side='true']) & {
+        padding-inline-start: calc(var(--zen-toolbox-padding) - var(--toolbarbutton-outer-padding)) !important;
       }
 
       & toolbarbutton {