They seem to hate F-droid for some reason. There are also many red flags that make me very suspicious

I wouldn't use it personally

It definitely has an F-Droid repo, here it is: https://fdroid.ironfoxoss.org/fdroid/repo/index.html

IronFox is Firefox ESR-based, completely de-Googled, has zero telemetry, and comes pre-hardened for privacy.

There is no official Firefox ESR (Extended Support Release) version for Android. The releases itself say they are based on the most recent stable releases.

Where did you get they're "ESR-based" from?

Correct me if I'm wrong but I think we are still waiting for true tab process separation.

I love IronFox and use it alongside Vanadium. When Fission is confirmed I will bump IronFox back up to most browsing - vastly prefer Gecko browsers as a user but concerned about tab isolation and tracking.

iIRC IronFox has Fission already but there was a dangling question regarding an inability to still isolate processes.

This isn't on the IronFox devs either - it really needs to be fixed upstream by Mozilla

This is the peak Firefox forks for android privacy/security

You actually can get this on fdroid, but you have to add the repository manually. Instructions are here in the readme

https://gitlab.com/ironfox-oss/fdroid/-/blob/dev/README.md

It's available on Accrescent.

I found it broke too many websites for my taste.

used it for a while but something recently made it too slow to use. websites take around 10 seconds to load, when on fennec they open up almost instantly...

You can get it from F-Droid if you add the Repository from Github and paste it into the app.