If you're encountered the problem mentioned in a number of these reviews where you attempt to login to the RescueTime add-on and you can't type in the email field, the work around from the add-on developer is mentioned here ( https://addons.mozilla.org/en-us/firefox/addon/rescuetime-for-firefox/reviews/804290/ ) stating "We've been able to reproduce the issue. As far as we can tell, the problem with not being able to interact with the window ONLY happens when the RescueTime icon located on the menu panel (under the hamburger icon on the far end of the toolbar). If the RescueTime icon is directly on the browser toolbar, the window works. While we work on a fix, the workaround is to move the icon to the browser toolbar. If you do not want the icon on the toolbar, you can put it there temporarily, sign in, then move it back to the menu panel and the site tracking should work just fine."