I am one of the developers of the Censor Tracker add-on, which is listed on Mozilla’s add-on repository. We recently noticed that our add-on is now unavailable in Russia, despite being developed specifically to circumvent censorship in Russia. We have not changed any visibility settings, nor have w...
Tbf, it's probably to prevent Russia from carpet banning Mozilla services and products. They might just do that, create a new foundation called "MegaLizard", with the browser "Greyhound"...
That being said, unlike with Chrome, installing third party extensions for Firefox outside the extension store is fairly uncomplicated.