If you check those toolbars on the Add-ons page, does it say they were disabled because they cannot be verified? I have attached an example of that kind of message (first screen shot). To check the Add-ons page, either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. The disabled ones are at the bottom of the list on the right side. Until they are updated, you can make a global exception to the signing requirement; there's currently no way to only make an exception for specific extensions. (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste '''xpin''' and pause while the list is filtered (3) Double-click the '''xpinstall.signatures.required''' preference to switch it from true to false -- note that this is for Firefox 43 only I have attached some screen shots illustrating the about:config page and the change you should see on the Add-ons page.