Just an addition:
If you want to use the stock Firefox version, you can install the FFUpdater app. FFUpdater can be found on F-Droid.
IcaCat hasn't been getting updates for a rwally long time now. Also no Fennec update yet...
What a pity. I use Klar and it is so nice.
I think bromite is a good browser, top notch privacy and security, active development and regular updates. They also have their own FDroid repo.
Theres also an 'unofficial' Firefox fdroid repo. Has all the different firefox android apps scraped from Mozillas github - latest versions of the official builds, signed by Mozilla.
@infosechandbook Or to be more clear: Whenever possible, pick a distribution channel provided by the developer.
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