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Mozilla Firefox is Working on a Tab Grouping Feature
(news.itsfoss.com)
A place to discuss the news and latest developments on the open-source browser Firefox
I just use several windows on several virtual desktops. It's much less cluttered.
Those hacks are needed because windows can't handle many things at once.
or multiple windows in tabbed mode (in i3 for example) or use the suckless tabbing thing