All previous versions of firefox should continue to be available.
This thread will probably get archived and locked, but I'll restart another one anyway. Firefox seems to be degenerating in terms of UX an stability, and especially if people are running custom OSs like lineage OS, it's unlikely that the latest android version will actually install at all. As a result, a lot of people are installing older versions of firefox, especially versions which allow access to "about:config" so firefox can be modified to be usable.
When googing for this, there are a lot of non-mozilla websites offering downloads, filled with God knows what malware added. It would be better if there was a permanent archive of all the previous versions, including the nightlys, so that people could at least access the older, working, versions from a trusted source. You might think this would be a bad security choice, but the current situation is worse.
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It has been over a year since the current generation of Firefox for Android was launched, and I'm not aware that it is becoming worse or less stable. What kind of problems have you encountered? (If you mean it is missing features from the previous generation, yes, it is.)
Firefox Nightly for Android has about:config, and I think Firefox for Android Beta may also have it.
Desktop versions of Firefox are all archived on http://archive.mozilla.org/pub/firefox/ (or http://ftp.mozilla.org/pub/firefox/). I don't know whether there is a similar archive for mobile versions.