.... I have exactly the same problem - I can't get in anymore... (It's German, but it says “set permission”). I have removed and reinstalled the extension, tried different resolutions - no chance. The problem is the extension in Firefox. It works in Chrome, but I don't like switching browsers because of Last Pass.
I also have the same problem on my laptop.
Hope for a solution.
I happened to find a workaround. When you see that Windows “Set permission”, click on this message and navigate with the “TAB” key down to the “accept” button.