uBlock Origin works fine with Firefox but it’s not better. Brave Shield is basically UBO rewritten in Rust and integrated directly in the browser code so it isn’t limited by the extension API and works more efficiently.

This! I never understand people who recommend Librewolf or other forks over Firefox just because some default settings are better.

I trust Vanadium but it’s not the best if you like your web ad-free.

What helps short term for me are workouts, mostly strength training, and playing board and role-playing games with friends (often online), a nice combination of socializing and concentrating on something. On bad days I’m ignoring the news even though I like to keep informed. For long term improvement I’m looking at getting more into Buddhism, which has shown some promising early results. It’s all about alleviating personal suffering, basically a system of therapy so effective, people made a religion out of it. (The religious trappings can easily be ignored and usually are outside of Asia.)