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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.
They have other things to consider as well, such as accessibility. You can't just eliminate all whitespace without consequences.
I do agree it should be easily configurable, but my point is that they're better than pretty much every competitor, so I'm satisfied.
How did floating tabs improve accessibility over the previous design?
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.