I strongly believe that if Opera had had a cool name, it would have been a real contender. People don't like operas, they're boring and stodgy.
And although browsers are no longer distinctly better than each other, I still donate to Mozilla.
What a fun time.
https://github.com/marklieberman/foxygestures
https://otter-browser.org/ (Tools → Preferences… → Advanced → Mouse → [X] Enable mouse gestures)