I'll be convinced web browsers have regained their independence when they start including blockers for modal interfaces, which have replaced the pop-up as the preferred method of hijacking the user's attention.
https://github.com/pkgdemon/ladybird/issues/1
https://old.reddit.com/r/gnustep/comments/1q0pdd6/ladybird_p...
(Yes there is some Apple webkit in between)
But if uBlock Origin doesn’t have first-class support when this browser becomes available… yeah.
They don’t even need to have a plugin interface ready, so long as the plugin guts are there and uBlock has been whitelisted for manual (drop directly into the profile filesystem) installation.