

Why do you assume they haven’t warned Mozilla in advance?
Also, Mozilla was fully aware that what they were doing is in breach of GDPR. I find it extremely hard to believe that the makers of Firefox are not fully familiarized with it by now.
Last but not least Mozilla is doing this for financial gain. It’s selling pur data to advertisers. Why should we excuse it? It’s a very hostile act.
If Mozilla has hit rock bottom and has been reduced to selling our data to survive then that’s that. We’ll find another way and another FOSS browser. Accepting it is not an option.
The problem is that the main container can (and usually does) rely on other layers, and you may need to pull updates for those too. Updating one app can take 5-10 individual pulls.