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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.
I have been running vertical tabs for a while now and it's broken about 3 times, once every few months. Currently, I've had no min/maximise/close buttons for about a week because I can't be bothered to fix it. Far from "one and done".