Just a warning to any of you who still think that adblock is only going to get better, the MV3 transition has started up again. Adblock is basically dead for the normies very soon, the only solution will be integrated solutions like what Brave does https://developer.chrome.com/blog/resuming-the-transition-to-mv3/
Resuming the transition to Manifest V3 - Chrome for Developers

Build the next generation of web experiences.

Chrome for Developers
@BrodieOnLinux Firefox and chromium forks with adblocker solutions are the way to go 
@10volt Mozilla has said they're keeping around MV2 and will offer developers either as an option, as for Chromium basically Brave, Vivaldi and Opera (If you're that kind of person) are all that matters
@BrodieOnLinux @10volt Being that the Mozilla Foundation is Google's bitch (money, ya know), I wouldn't trust that much. Or, at least, I'd expect to Firefox to remove MV2 at some point.

As for the Chromium-based browsers you mentioned, it'd be a good idea to see if their integrated ad-blockers don't depend on the API Google is trying to deprecate (which it's something I don't know).
@BrodieOnLinux @10volt iirc they're basically also allowing the API that adblockers used in V2 in V3 as well, to not force them to stay on V2.

@10volt @BrodieOnLinux ublock origin (not lite) would technically be able to be ported to mv3 on Firefox. Mozilla (at least as of 2021) will be keeping the webRequest api around in mv3. It will end up like the DNS api where only ff supports it.

https://blog.mozilla.org/addons/2021/05/27/manifest-v3-update/

Manifest v3 update – Mozilla Add-ons Community Blog

Manifest v3 support for Firefox extensions is coming in late 2021. See a high-level summary of changes to the platform.

Mozilla Add-ons Community Blog
@10volt @BrodieOnLinux it would be ironic if this is what made normies FINALLY switch to Firefox