Nope, we have never claimed to be the ‘successor’ of Mull. I already explained this in my reply to you on the F-Droid forum:
Both IronFox & Mull share the same fundamental vision & ideals of improving the privacy, security, & freedom of Firefox on Android, and contain many of the same hardening, patches/build scripts, and other features. IronFox is indeed not a ‘true successor’ to Mull; as it is not developed by Divested Computing Group, so it wouldn’t be fair to claim it or any other fork is… our goal is to simply carry on the spirit of Mull and continue Tavi’s excellent work on the project.
I also explained this in the F-Droid thread:
See here for a comparison table. (IronFox uses the Phoenix Hardened configs, so the bottom table for Advanced Hardening also applies). It’s a little outdated, though most of it still applies. IronFox does make a few changes from Phoenix as well (Most notably: IronFox disables DNS over HTTPS & disables Safe Browsing by default (at least that’s the goal…)), but this should still give you a nice idea of the broader picture and what to expect.
Generally speaking: Phoenix contains the same hardening as Arkenfox & Mull; while being more comprehensive & also specifically tailored to Android. Many of the preferences were indeed taken from Arkenfox & Mull, as well as from Tor, & various other places. A lot have also simply been added from my own research & studying of Firefox’s codebase.
I hope this addresses your concerns, assuming you are acting in good faith.
Unfortunately, Firefox on Android doesn’t currently expose DoH in the UI settings; it can only be configured via the about:config.
We set the default DoH provider (if DoH is enabled) to Quad9, and since it’s not exposed anywhere in the UI; we didn’t want to send users’ DNS queries to a third party like this without them knowing.
In the future, we plan to add options for configuring DoH to the onboarding (as well as Safe Browsing), so that users can decide for themselves what to use, and be fully aware of the changes they make.
We definitely do recommend using DoH or DoT for privacy & security reasons.