Opera used to be a fantastic web browser, with a custom high-performance Presto rendering engine and features like tabbed windows that didn't show up in competing browsers until years later. However, the modern Opera browser is a shadow of its former self, reliant on chasing trends and meme advertising to
Nothing. Ideally you’ll take a privacy hardened fork though, like Fennec or LibreWolf.
For android there’s iceraven and mull.
Isn’t fennec on android?
Yes.
I never used fennec.