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Stop using Opera Browser and Opera GX
(www.spacebar.news)
This is a most excellent place for technology news and articles.
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