I gave Opera and Vivaldi a try. Something visually about both browsers made me feel sick. Back to Firefox.
I don't feel like Vivaldi is mature enough. And Opera is own by Chinese company now that has business in advertising no?
Firefox from 2004 up until a year ago. Now with Waterfox and happy with it. Messed around for a bit with most of the other browsers off and on over the years, but always returned to FF. Rather sure I will stay with Waterfox.
I've been using Firefox since Opera decided to "go the Chrome way". I also tried Chrome not too long ago. Didn't like it at all, so went back to Firefox. PS: I use MS Edge if websites do not open properly in Firefox but, fortunately, this does not happen very often.
Running the new version of Firefox. The reduced memory usage is appealing to me because I have a laptop with only 3GB of RAM.