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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.
https://support.mozilla.org/en-US/questions/1338169
Before this, tabs were clearly separated and were directly connected to the rest of the browser UI, while also using much less space & padding. It was one of the major enshittification updates for Firefox and to this day they have not given us any of those mentioned "use cases and features" that would make use of this redesign.
That's not what that term means. That term specifically and explicitly means "making a service worse for the user in order to wring more money out of it." It doesn't mean "feature or design change I didn't like."