on f-droid there is a hardened firefox fork: mull
It does replace system webview.
Both Vanadium and Mulch are powerful. Mulch is Divest os default vebview and is using Vanadium patches. While the Vanadium is Graphene one.
https://gitlab.com/divested-mobile/mulch
https://github.com/GrapheneOS/Vanadium
I stick with Mulch, because I added divest repo to Droidify, so I can upgrade webview as soon new update comes out. No need to wait for module update.
Haven’t found a good way to easily update Vanadium. On XDA module’s thread you can read about it.
https://xdaforums.com/t/magisk-module-webview-open-webview-2-3-1.4496119/
if you root, you can install open webview module.
currently using mulch webview and updating it in f-droid
Btw, modern cars are often nightmare for privacy. Mozilla has recently posted about it.
However, I saw on github that someone made android auto work with microg!
the most useful extensions for android firefox - ublock origin, there is already (and many more). Also, mozilla is working on bringing all desktop add-ons to mobile and everyone can contribute.
don’t recommend manjaro. instead - vanilla arch or endeavour os
I’m not sure if using Librewolf on desktop or Mull on mobile counts but they are pretty good hardened forks of Firefox.
Firefox is great but the downside is that it isn’t as private as browsers I’ve mentioned by default. Still, it is solid choice from privacy perspective.
Redlib