Since you seem disenchanted with Firefox, you might take a look at. Brave and/or Vivaldi. Both are derivatives of Chromium, which is the open source version of Google Chrome. While I'm not a particular fan of Google, Chrome is one of the best browsers around, and both Brave and Vivaldi are far enough removed from the Google collective that I am comfortable that they won't be phoning home to the Borg. (Note: I am not so confident about the extensions from the Chrome Store.)

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein