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You asked, we built it: Firefox tab groups are here | The Mozilla Blog
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Yeah, thought the same with vertical tabs already. It's extremely cool that it's there now for folks who want it, but if you have a strategy for putting tabs into multiple windows and then dealing with those windows appropriately, then there's really no point in making it a vertical list for the handful of tabs per window you'll likely have...