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
I tried using hardened Firefox before moving on to use LibreWolf. Manually hardening Firefox is arguably more powerful than what you’d have with LibreWolf out of the box, but the effort involved in making those changes in the settings and remembering what they are (what they were by default, and what they were changed to) makes it hard to maintain.
Do you mean across devices? I don’t think it changes the settings when it updates but i could be wrong.