TL;DR: Mozilla is killing localization on Support Mozilla, overwriting articles written by humans with machine generated translations. Although Mozilla knows that their AI doesn’t localize or adhere to style guides, Mozilla is going live with it anyway. I thank locale leaders and localizers for their tireless efforts. Locale leaders seem to be obviated by AI, and Mozilla has nothing to say about it.
Your conflating a fork, with using an engine in your own browser. Nobody is forking Gecko, Blink, or WebKit. LibreWolf is a modified Firefox, not a fork. The LibreWolf team takes every update to Firefox, removes a few features, ads a few more, and releases their version. Same with Brave. Neither is maintaining their own separate fork. They just take the latest from Mozilla or Google and incorporate their code into it.
Maybe someone could fork one of them. Though they wouldn’t be getting any assistance with feature or security updates from the original branch anymore. They’d be totally on their own with what could quickly be an old code base. Which is why nobody does that.
But back to the important part. What do I need to be saved from?