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Mozilla is adding tab grouping, vertical tabs, profile management, and local AI features to Firefox
(connect.mozilla.org)
This is a most excellent place for technology news and articles.
To be honest, it's not just for phones. The wider the monitor, the more I'd need to move my head if a website uses the whole space, instead of keeping it centered. Obviously it shouldn't be too slim but you can't really just fill an entire monitor or align your content to the left of the screen anymore nowadays.