You want some Skunk?

Mine does the same (well, even less trusty addblocks are blocked).

But I found that copy/pasting the profiles folder of Firefox does the trick. In this folder there is an extension folder and xpi files that I can backup on the corporate cloud + usb drive to restore all my extensions.

Cause yeah, extensions are blocked but pasting into %APPDATA%\Mozilla\Firefox\Profiles\ is not :)