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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
Pretty much every update screws up my config these days, but it's good because it means they're actually working on improving the interface
I think this update was the first one that brake my config in a long time. I was actually expecting this from vertical tabs update but it went fine. The current UI of Firefox looks too mobile-y. Thankfully we got add-ons and CSS options.