Bug 1519121 - Fix browser_ext_optionsPage_popups.js test failure on 66 Beta due to userContext feature disabled. r=mixedpuppy

Differential Revision: https://phabricator.services.mozilla.com/D16219

--HG--
extra : moz-landing-system : lando

browser/components/extensions/test/browser/browser_ext_optionsPage_popups.js

@@ -88,9 +88,14 @@ add_task(async function test_tab_options_popups() {
     "context-openlinkintab",
     "context-openlinkprivate",
     "context-copylink",
-    "context-openlinkinusercontext-menu",
   ];
 
+  // Test that the "open link in container" menu is available if the containers are enabled
+  // (which is the default on Nightly, but not on Beta).
+  if (Services.prefs.getBoolPref("privacy.userContext.enabled")) {
+    contextMenuItemIds.push("context-openlinkinusercontext-menu");
+  }
+
   for (const itemID of contextMenuItemIds) {
     const item = contentAreaContextMenu.querySelector(`#${itemID}`);