Vintager:
A problem at Mozilla's end resulted in
all extensions in use (with both Firefox itself and with forked versions, such as IceDragon and Tor) becoming disabled:
https://www.theanswerbank.co.uk/News/Question1656838.html
Now that the problem has been fixed, all extensions should automatically have been re-enabled in Firefox, but not necessarily in forked programs. If you've got disabled extensions in IceDragon, uninstall them, close IceDragon, restart your computer (possibly not necessary but often best done anyway), open IceDragon and reinstall the extensions.