I hope Firefox never drops MV2. I have a lot of other extensions that use it other than uBlock. Can't believe Google really went through with it. We are truly in the end times of "personal" computing, very sad to see :/

MV3 itself isn't what breaks uBlock Origin, it is the bundled removal of capabilities that Chrome decided to do. Firefox MV3 supports full WebRequest "scopes" while Chrome only supports declarativeNetRequest.