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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.
If they go back to non-floating tabs, you'd save like 2-3px per my screenshots. You seem to want more than that, and that's where the accessibility issues come up.
I love how you didn't answer the question and instead went on a hypothetical scenario with an outcome that is a flat out lie.