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Vivaldi's tab tilling add-on in Firefox
(lemmy.dbzer0.com)
A place to discuss the news and latest developments on the open-source browser Firefox
By tab stacking you mean that feature where you can create those collapsible tab groups, right?
It's different. Instead of grouped tabs that expand within the same row of tabs, tab stacks show the group in a second row of tabs. Works great if you have a lot of tabs that tend to shrink in width to much to be usable.