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
Vivaldi Browser is headed by some of the original founders of Opera ASA and is a reasonably good alternative to Google Chrome, MS Edge, Safari and new Opera itself.
Alternatively, use Gecko-based browsers such as Firefox/Waterfox/Iceraven.
Vivaldi is very pretty, but certainly more on the heavy side of the chromium spin-offs, and also they won’t fight the manifest v3 implementation.
Not sure how they could fight manifest v3, it’s Google making an (objectively bad) internal code decision that has knock-on effects for Chromium and everyone else.
FWIW they are going to try and keep things working and are looking for workarounds