If telemetry is the problem, the rational thing to do is to use a fork/build of Firefox without the telemetry, not support the Google monopoly or go for browsers that have had potentially problematic privacy policies for a lot longer than Firefox.
The issue is that any firefox-based browser on Android lack of per-site isolation unlike chromium browser. It's a security issue that Mozilla doesn't seem interested in fixing. And it does impact every fork such as IronFox (previously Mull)
I am mainly using Firefox engine on all my computers but on Android I am using either Vanadium when on GrapheneOS and a tweaked brave when not.
For me personnaly it has nothing to do with supporting Google's monopoly on web tech or not. It's not about telemetry either, it is a security concern.
I think I might give IronFox a go, just a bit weary as never heard of it before, not sure who is the owner of the project and where they are based, GitLab project only has ~125 stars.
Have you ever used the Accrescent app store? That's their recommended option for installing it.
I'm pretty sure the Acrescent store is independent from Graphene OS - though they just seem to like the project so much they made it available in their own "App Store"
Yes this is more correct. They wanted to provide to their user an alternative store that meets their security criteria so GOS users can download and install other apps safely.