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Vivaldi's tab tilling add-on in Firefox
(lemmy.dbzer0.com)
A place to discuss the news and latest developments on the open-source browser Firefox
While that's definitely where we need to aim, chrome has such a massive market share even if all the non chrome browsers band together it might not be enough.
I can see banks and employment sites implementing these things and forcing the hand of the smaller browser. I hope I'm wrong, but that seems likely.