As of today, all of my Firefox extensions have stopped working and all of the search engines have been removed from the Default Search Engines menu. I've tried everything I can find for either problem, but nothing has worked and they seem related? Extensions: * Reinstalling extensions did not work. They're still listed as enabled on my extensions settings page. * I'm not in private browsing mode and my extensions are set to be usable in private mode anyways. * Extension icons don't appear anywhere in the customizing menu for the toolbar, including the overflow menu. Search: * Deleting the search.json.mozlz4 file did not work; it didn't create a new file. * "Restore Default Search Engines" button in search options is grayed out. Both: * Reinstalling Firefox did not work. I have no idea what to do at this point.