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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.
The default experience when people Google "install Firefox" should absolutely provide as much feature parity with other major browsers as possible. 99% of users will want them or not mind them. And for that last 1%, I guess I'm not sure if it's worth the development headaches for them to bake in a configuration change that power users could get by forking the codebase anyway.