You can't access about:config in the release version of mobile Firefox. Only in the beta or nightly builds. The beta version is reasonably stable to be fair although it can fluctuate.
This is true, but I encourage people to check out either mull browser or fennec. Both forks of Firefox on Android with privacy enhancements, the ability to use any Firefox store addon (this may be in release now I am not 100% sure) and access to about:config. I've not found stability issues with them either
I've been using fennec as my main browser for a long while now and it's great
but I'd prefer Mozilla stop being blazingly stupid and stop fucking over people who don't throw 2000 dollars at mobile devices that come with terrabytes of storage internally.
Not that I know of unfortunately. It's been a while since I've been on iOS so I may be wrong, but I believe all browsers in iOS are actually webkit under the hood (what safari runs on). So any fork of Firefox for iOS would also be just that, quite different from desktop or Android Firefox. I did hear the due to some rule changes Mozilla may be working on a non webkit version of Firefox for iOS but that remains to be seen
I discovered mull only about a month ago, but yeah, its great. As close to Librewolf you'll get on mobile. A limited number of extensions work, but my favs are there. Ublock, NoScript, Decentraleyes, Dark Reader, Clear URLs. It also has access to about:config and is available on fdroid. Great mobile fork.
I just share the download link to my file manager (MiXplorer) and I can pick and choose where the download goes.
It's not exactly what you want and some downloads (with redirects) might not work, but ever since i've used Mix, I use it exclusively to download everything from Firefox.