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Mozilla is adding tab grouping, vertical tabs, profile management, and local AI features to Firefox
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
It's great how Firefox can be customized through userChrome.css und user.js. I'm only using the former to put the tab bar in the same row with the url bar to save vertical space while using sidebery/vertical tabs, but it's good that it's still available.