desktop/src/browser/base/content/browser-commands-js.patch

diff --git a/browser/base/content/browser-commands.js b/browser/base/content/browser-commands.js
index 75ddd82c18979571f377dec94fe1883f1349cc16..129d78214db53fc8dbd17d23b4a5a042ec297a41 100644
--- a/browser/base/content/browser-commands.js
+++ b/browser/base/content/browser-commands.js
@@ -14,6 +14,10 @@ var BrowserCommands = {
     const where = BrowserUtils.whereToOpenLink(aEvent, false, true);
 
     if (where == "current") {
+      if (!gBrowser.webNavigation.canGoBack && gZenCommonActions.shouldCloseTabOnBack()) {
+        gBrowser.removeTab(gBrowser.selectedTab, { animate: true });
+        return;
+      }
       try {
         gBrowser.goBack();
       } catch (ex) {}
@@ -315,6 +319,10 @@ var BrowserCommands = {
       }
     }
 
+    if (gZenUIManager.handleNewTab(werePassedURL, searchClipboard, where)) {
+      return;
+    }
+
     // A notification intended to be useful for modular peformance tracking
     // starting as close as is reasonably possible to the time when the user
     // expressed the intent to open a new tab.  Since there are a lot of
@@ -399,6 +407,14 @@ var BrowserCommands = {
       return;
     }
 
+    if (gBrowser.selectedTab.hasAttribute("zen-empty-tab")) {
+      if (gBrowser.selectedTab.hasAttribute("split-view")) {
+        return;
+      }
+      gZenWorkspaces.handleTabCloseWindow();
+      return;
+    }
+
     // Keyboard shortcuts that would close a tab that is pinned select the first
     // unpinned tab instead.
     if (
@@ -406,8 +422,8 @@ var BrowserCommands = {
       (event.ctrlKey || event.metaKey || event.altKey) &&
       gBrowser.selectedTab.pinned
     ) {
-      if (gBrowser.visibleTabs.length > gBrowser.pinnedTabCount) {
-        gBrowser.tabContainer.selectedIndex = gBrowser.pinnedTabCount;
+      if (gBrowser.visibleTabs.length > gBrowser._numVisiblePinTabs) {
+        gBrowser.tabContainer.selectedIndex = gBrowser._numVisiblePinTabs;
       }
       return;
     }