After a full review of all Mozilla's addon troubleshooting pages, the addons I use everyday either don't appear upon my use of a mouse right click or don't work when clicking on them in the browser's header bar, and I haven't downloaded the new Firefox version for GREAT fear of AGAIN loosing ALL of my addons for the second time. And not being able to use my lost addons have crippled my production, because their replacement have not been nearly as good. To remove an addon was easy, but reinstalling it won't fully engage even when the page popped up and gave me the option to install it. It's just spinning. I imagine we're not talking about a sudden incompatability without an upgrade. Your help is welcome.