I installed the mull browser revently. People who are familiar with this will know that it’s a fork of firefox android. It’s hardened but I haven’t noticed much difference b/w the two. Mull has a few visible tweaks like Https mode by default, strict protection etc. but I haven’t come across other backend/not so visible changes. How is it different from firefox android?
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You’re right about being cautious that they might be discontinued, but you can always port them to another Firefox port. Also this is a fork from Firefox stable and applies patches to it, so not a ton of custom code needs to be done.
Not possible on mobile though. On Desktop I am working on Arkenfox-softening that modifies the arkenfox user.js and makes updates easier.