--- a/browser/components/extensions/ext-sidebarAction.js
+++ b/browser/components/extensions/ext-sidebarAction.js
@@ -104,21 +104,16 @@ this.sidebarAction = class extends Exten
     for (let window of windowTracker.browserWindows()) {
       this.updateWindow(window);
       if (install) {
         let {SidebarUI} = window;
         SidebarUI.show(this.id);
       }
     }
 
-    // Bug 1331507: UX review/analysis of sidebar-button injection.
-    if (AppConstants.RELEASE_OR_BETA) {
-      return;
-    }
-
     if (install && !Services.prefs.prefHasUserValue("extensions.sidebar-button.shown")) {
       Services.prefs.setBoolPref("extensions.sidebar-button.shown", true);
       // If the sidebar button has never been moved to the toolbar, move it now
       // so the user can see/access the sidebars.
       let widget = CustomizableUI.getWidget("sidebar-button");
       if (!widget.areaType) {
         CustomizableUI.addWidgetToArea("sidebar-button", CustomizableUI.AREA_NAVBAR, 0);
       }