If you...

1. Love about:config and extensions that don't work properly
2. Hate properly scaled DPI-dependent art assets, app signatures, and ever getting a single security update

Then have I got the thing for you:

Iceweasle Mobile!

Definitely not brought to you by Mozilla!

It has a new icon

I grabbed it from the Wikipedia article on Iceweasle. Seeing as the point of Iceweasle is to drop Firefox(TM) branding to avoid trademark complaints, I hope the real Iceweasle's maintainers (Parabola GNU/Linux-libre) don't mind. I am not them and this is not their Iceweasle.

It conspicuously refuses to identify itself as "Firefox Browser"

It's just "[big blank space] Browser" in a terribly downscaled image. Although you can still (probably) "Sign in to Firefox" (the sync service).

It has numerous terribly broken addons

It sources a list of add-ons to use from here instead of using the Mozilla list. Sadly I can't list every add-on in the world in the Fenix add-on UI, but if you make a PR to this repo's fork branch and the corresponding android-components to make it just accept any add-on I can merge it, and if you have an add-on you want on the list I can add it. Unless I'm busy, asleep, or otherwise don't care.

It has the legendary, often-imitated, never-duplicated about:config

This despite being a "stable" release build (not Nightly-based).

It has roughly zero security

I built this from the then-current-ish Fenix version of Firefox. I definitely can't commit to keeping it up to date, so you will get hacked, and it's signed with whatever debug keys Gradle dug up, so you will have your passwords stolen by apps pretending to be this one. Also, it claims to have a Privacy Policy, but that's just what Mozilla told it to say. I don't have my own privacy policy because I am a suspicious individual on the Internet and the app isn't supposed to send me anything anyway. It probably does still send stuff to Mozilla though.

Remember the Iceweasle Motto:

If you aren't me, you probably shouldn't use this.