

To generalise, just as Reddit is the neolib centrist hivemind and Facebook is the conservative boomer hivemind, Lemmy is some overlap of privacy/techy/ultrapolitical groups - so whenever you get this kind of news that is ultimately pretty mild and uncontroversial to most you get lots of Lemmings buttons pushed and what seems like an oversized reaction in the comments.
Is Firefox perfect? No. Is it still the best available mainstream browser option? Yes. And if the small groups that presently use it walk away and its tiny market share (~5%) declines to a point where Firefox becomes insolvent - well then browsers will be just a two-horse race between Google (Chromium) and Apple (WebKit). Every web spec and page will be beholden to the desires of those companies - I’m sure the same Lemmings will be complaining about that too, and by then it will be too late to realize what they’ve lost.
Builds in a very expensive replacement component too.
A control button breaks? New button is a (still over-inflated) $75 to replace.
A Tesla control screen breaks (and they do, just as often as buttons) - $1500.
https://www.greencarfuture.com/electric/tesla-screen-replacement-cost-process#Cost