Fixed critical bug and updated to 1.7.4b

src/browser/base/content/ZenUIManager.mjs

@@ -1,6 +1,7 @@
 var gZenUIManager = {
   _popupTrackingElements: [],
   _hoverPausedForExpand: false,
+  _hasLoadedDOM: false,
 
   init() {
     document.addEventListener('popupshowing', this.onPopupShowing.bind(this));
@@ -23,6 +24,10 @@ var gZenUIManager = {
       )
     ).observe(document.getElementById('navigator-toolbox'));
 
+    window.addEventListener('DOMContentLoaded', () => {
+      this._hasLoadedDOM = true;
+    }, { once: true });
+
     window.addEventListener('TabClose', this.updateTabsToolbar.bind(this));
   },
 
@@ -213,7 +218,7 @@ var gZenVerticalTabsManager = {
   },
 
   animateTab(aTab) {
-    if (!gZenUIManager.motion) {
+    if (!gZenUIManager.motion || !aTab || !this._hasLoadedDOM) {
       return;
     }
     // get next visible tab

src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css

@@ -72,7 +72,11 @@
 }
 
 #browser {
-  --zen-toolbox-padding: max(.4rem, calc(var(--zen-element-separation) / 1.5));
+  --zen-min-toolbox-padding: .4rem;
+  @media (-moz-platform: macos) {
+    --zen-min-toolbox-padding: .52rem;
+  }
+  --zen-toolbox-padding: max(var(--zen-min-toolbox-padding), calc(var(--zen-element-separation) / 1.5));
 }
 
 :root[zen-single-toolbar='true'] {

src/browser/themes/shared/browser-shared-css.patch

@@ -0,0 +1,13 @@
+diff --git a/browser/themes/shared/browser-shared.css b/browser/themes/shared/browser-shared.css
+index b4854731c08b2f463751bb907cb44130ee6b6d2a..18d96cb457f5e57ed00b4eec6d2702287bfc72c7 100644
+--- a/browser/themes/shared/browser-shared.css
++++ b/browser/themes/shared/browser-shared.css
+@@ -147,8 +147,6 @@ body {
+    */
+   &.fullscreen-with-menubar {
+     z-index: var(--browser-area-z-index-toolbox-while-animating);
+-    box-shadow: var(--content-area-shadow);
+-    border-bottom-color: var(--chrome-content-separator-color);
+   }
+ 
+   /* Themes define a set of toolbox foreground and background colors which we

surfer.json

@@ -19,7 +19,7 @@
       "brandShortName": "Zen",
       "brandFullName": "Zen Browser",
       "release": {
-        "displayVersion": "1.7.3b",
+        "displayVersion": "1.7.4b",
         "github": {
           "repo": "zen-browser/desktop"
         },
@@ -39,7 +39,7 @@
       "brandShortName": "Zen",
       "brandFullName": "Zen Twilight",
       "release": {
-        "displayVersion": "1.7.2t",
+        "displayVersion": "1.7.4t",
         "github": {
           "repo": "zen-browser/desktop"
         }