I can say that while Firefox people definitely haven't "given up," they keep killing every feature people love, and bringing in features that their core demographic doesn't care about. 64-bit doesn't matter, it has to be installed differently and my mother isn't going to figure out how or which version she's launching. Multi-process? For what? Javascript apps are still going to run in a single thread, and background tabs are still going to be slowed to a crawl. If they don't, nobody will notice anyway.
The add-on story is far worse. They keep threatening to get rid of extensions and only support X or Y type (is XUL still being pushed? I haven't checked lately). There's so many uncertainties there.
What I'm saying is, I love Firefox as a piece of tech, but they keep abandoning their community in the pursuit of some ideal that none of their users care about. My favorite example of this? There is a bug in Firefox where if you disable a button in Javascript for whatever reason, and then refresh the page, that button will remain disabled because it's "preserving the form state" even if the HTML clearly defines it should start enabled (like form validation or something, it doesn't matter, really). This is /only/ in Firefox, and the devs won't accept a fix patch or fix it themselves, because "it would be a bad user experience." The user can't disable or enable a button without using Javascript anyway, and that's not a user at that point. Logically, without any opinion on what should be done, none of this behavior should exist, but it was added by design from the core devs.
That is not the only example, but it is a distilled version of their attitude towards users and devs. Their story is the only reality. It is as this point that any project ultimately loses all but the die-hard fans. Lots of historical precedence on that one.
https://bugzilla.mozilla.org/s... It's 6 years old, the Bootstrap team started weighing in 3 years ago. This is why people might believe they have "given up." An incorrect wording in my opinion, but the sentiment is accurate and measurable in their written communications.