I am using Graphene abd I disabled Vanadium due to it being Chromium essentially. I use Navi or Download Navi from F-Droid. It does not have as much web functionality as Vanadium, but I don’t use phone for websites, I read websites on computer or laptop, but occassionally something might need a browser momentarily so that’s what Navi for.
If you want a web browser for privacy, I would suggest use F-Droid and in Settings under Anti-features, turn off every option in there, do a search for browser and see what you think of the options. It’s either cheap development or old. A mobile web browser that protects privacy doesn’t seem to exist with the capabilitied of a Firefox.
I’m a strong believer that there is no such thing as a privacy respecting browser that is closed source. For that reason, I use IceCat on computer.
Navi has a built-in download manager, it is not a standalone download manager. I use Navi as a light web browser for websites in case I never a browser on phone.
I do not compile IceCat, it’s available in different repositories.