I'm a Firefox user since forever, and will keep using it. I also want Mozilla to win, and strongly empathize with their engineers whom are trying to make the best of it.
That said, I think the reality check should not be avoided. There is no good in do-good software without reach.
Based on statcounter, Firefox's market share went from a 2009 peak (32%) to a mere 3.29% as we speak. Just in the last year alone, it bleeds market share from 4.25% to 3.29%.
So it keeps bleeding market share, 12 years in a row. The reason it's still losing market share likely is due to the mobile market still growing in size, whilst Firefox has no presence there: 0.48%.
I have access to a handful of web properties, one of which very large and global (billions of page views). In our dashboards, Firefox does not even exist. It's not in the top 10. Above it are Chromium clones most have never heard of.
So to the "ordinary" world, those without a particular stake in open source, it's a dead browser. It's even smaller than weird regional browsers that most businesses wouldn't explicitly support.
(note that "support" is overstated as most web tech works just fine out of the box in Firefox)
Besides the ordinary world, the grip on the developer community is also lost. Increasingly, I'm seeing developers coding up demos and experiments that break in Firefox, it's not even considered at all, where just a few years ago it was a developer-default browser.
It's an extremely harsh reality check. Effectively Apple, an enemy of the open web, is our only savior against a full Chromium monopoly. Apple actively sabotaging and blocking the progress of the web, is our "hope". How bad can it get?
Anyway, I'm sorry to bring this up, in particular in a release announcement. I bring it up because I believe impact is central to the discussion and trumps any feature and any engineering. If the crash is not reversed somehow, it is inevitable that very hard questions have to be answered.
It's not what I would want. I hope an independent implementation will keep existing forever.