Seconded, Bromite is pretty damn good. Fennec/Firefox on Android is awful in comparison.
I fail to see your point OP. If you're concerned, wouldn't using a VPN + whatever browser with Adblock be more than enough if all you do is browse websites?
I'd be surprised if browsing imageboards got you on any sort of list but also normies are retarded so idk
Honestly idc whether I'm on some fbi watchlist. I'm nothing to them, really, and they are nothing to me too.
i highly doubt that you are going to be on a list for browsing imageborads and neocities. most of the people there aren't doing anything illegal. the ones that are i hope they have good opsec and practice internet safety.
You can check here how well you can be tracked by any site.https://www.amiunique.org/fingerprint
It's almost impossible to stay sushi rollymous. The best you can do is use the most common client with the most common settings and environment to disappear in the crowd to some degree. Otherwise your best shot would be to fake a second online identity, ideally with a different machine you scavenged from a junk yard at least 30 miles away from your location with a separate gateway/vpn to access the web.