fix: enhance tab unloading logic with permitUnload check and update candidate version and update to firefox 136.0.2

src/browser/base/content/zen-styles/zen-popup.css

@@ -360,7 +360,11 @@ menuitem {
   & .zen-toast {
     padding: 0.9rem 0.8rem;
     border-radius: 12px;
-    background: linear-gradient(170deg, var(--zen-primary-color) -40%, color-mix(in srgb, var(--zen-primary-color) 85%, #0f0f0f 15%));
+    background: linear-gradient(
+      170deg,
+      var(--zen-primary-color) -40%,
+      color-mix(in srgb, var(--zen-primary-color) 85%, #0f0f0f 15%)
+    );
     color: var(--button-primary-color);
     box-shadow: 0 0 14px 3px rgba(0, 0, 0, 0.05);
     border: 1px solid rgba(0, 0, 0, 0.1);

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

@@ -269,7 +269,7 @@
     }
 
     #tabbrowser-tabs:not([movingtab]) & .tab-content > image:active {
-      scale: var(--zen-active-tab-scale);
+      scale: 0.92;
     }
 
     & .tab-icon-image {

src/browser/base/zen-components/ZenPinnedTabManager.mjs

@@ -510,6 +510,10 @@
         case 'unload-switch':
         case 'reset-switch':
         case 'switch':
+          let { permitUnload } = selectedTab.linkedBrowser?.permitUnload();
+          if (!permitUnload) {
+            return;
+          }
           this._handleTabSwitch(selectedTab);
           if (behavior.includes('reset')) {
             this._resetTabToStoredState(selectedTab);
@@ -520,8 +524,7 @@
             }
             // Do not unload about:* pages
             if (!selectedTab.linkedBrowser?.currentURI.spec.startsWith('about:')) {
-              gBrowser.explicitUnloadTabs([selectedTab]);
-              selectedTab.removeAttribute('linkedpanel');
+              gZenTabUnloader.explicitUnloadTabs([selectedTab], { permitUnload });
             }
           }
           break;

src/browser/base/zen-components/ZenTabUnloader.mjs

@@ -235,9 +235,9 @@
       this.explicitUnloadTabs(tabs);
     }
 
-    explicitUnloadTabs(tabs) {
+    explicitUnloadTabs(tabs, extraArgs = {}) {
       for (let i = 0; i < tabs.length; i++) {
-        if (this.canUnloadTab(tabs[i], Date.now(), this.intervalUnloader.excludedUrls, true)) {
+        if (this.canUnloadTab(tabs[i], Date.now(), this.intervalUnloader.excludedUrls, true, extraArgs)) {
           this.unload(tabs[i]);
         }
       }
@@ -259,7 +259,7 @@
       }
     }
 
-    canUnloadTab(tab, currentTimestamp, excludedUrls, ignoreTimestamp = false) {
+    canUnloadTab(tab, currentTimestamp, excludedUrls, ignoreTimestamp = false, extraArgs = {}) {
       if (
         (tab.pinned && !ignoreTimestamp) ||
         tab.selected ||
@@ -271,6 +271,9 @@
         tab.attention ||
         tab.hasAttribute('glance-id') ||
         tab.linkedBrowser?.zenModeActive ||
+        (typeof extraArgs.permitUnload === 'undefined'
+          ? !tab.linkedBrowser?.permitUnload()?.permitUnload
+          : !extraArgs.permitUnload) ||
         (tab.pictureinpicture && !ignoreTimestamp) ||
         (tab.soundPlaying && !ignoreTimestamp) ||
         (tab.zenIgnoreUnload && !ignoreTimestamp) ||