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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 :)
As a corporate IT drone, usually the extension blocks come from on high and we have no say in what they are. Also, the users that are smart enough to figure out ways around the blocks are not who we are worried about protecting from themselves.