This is going to be a hard truth, and it is not going to be popular either.
I just finished building my own copy of Mozilla Firefox. I disabled, everything, and I do mean, everything. When done, there were no user settings, not even the simple back, forward, and home button. I stripped Gecko down to its core components, so the only function was to render websites.
You cannot optimize Firefox further (I don't think). I gutted it like a fish, and I think pushing it further would have broken it
15 years ago, on September 2, 2008, Google unleashed Chrome, but have you heard about Firefox?
While Chrome has its quirks, people will gladly tell you about the virtues of Firefox. It's like the trusty coffee shop on the corner of the street and the barista knows your coffee order by heart.
Remember, there's a fox out there offering an experience that's simply superior in so many ways.
Wer LibreWolf nutzt, der sollte die about:config öffnen und den Parameter "dom.push.enabled" auf "false" setzen. Ansonsten besteht eine dauerhafte Verbindung zu einem Mozilla-Service (Push-API), der bei Google (*.googleusercontent.com) gehostet wird. Ich hoffe, LibreWolf ist nicht falsch abgebogen - solche Änderungen sind nicht optimal, bei einem datenschutzorienterten Browser.