OP is concerned about Pocket integration too, so I assumed they may not like it.
these features will only improve your privacy over using some webmail.
Does their built-in mail support any good encryption? The last time I used Vivaldi a mail feature wasn’t really that private. Also, using dedicated email client like claws or mutt is even better from privacy perspective.
All google stuff is either removed or toggleable from settings.
They can’t remove Manifest V3 though.
What’s wrong with that? It’s a good deal larger than mozilla’s
Yes, and it’s under Google’s control. And, again when I used it last time, you need to enable some google stuff to install extensions from the store.