There's very little Linux love from firefox and mozilla. 10 years later and still no QT build[1], drops alsa because their implementation is broken and instead of fixing their own mess forces everybody to use pulseaudio[2] and quite a few in between.
It seems there's a reccuring "you do not represent a big enough portion of our users for us to care" attitude over time that made several not big enough portion of their users to stop caring and supporting firefox accelerating its demise caused by trying to be a chrome-like browser (among other mismanagement).
Having no love for Qt and Alsa is not the same as having no love for Linux.
GTK+ is the main graphic toolkit in the linux world and pulseaudio won the war a decade ago ! You may not like where the Linux world has been going the past few years (boo redhat, systemd and Lennart) but that's how it is now. You can't blame mozilla for supporting only the modern Linux world and not every esotheric configuration : that's the job of the distribution's maintainers !
It seems there's a reccuring "you do not represent a big enough portion of our users for us to care" attitude over time that made several not big enough portion of their users to stop caring and supporting firefox accelerating its demise caused by trying to be a chrome-like browser (among other mismanagement).
[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=451129 [2]: https://bugzilla.mozilla.org/show_bug.cgi?id=1345661