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Mozilla Firefox is Working on a Tab Grouping Feature
(news.itsfoss.com)
This is a most excellent place for technology news and articles.
I'm still confused why people are so hell bent on using a single window exclusively. It's a natural way to group the tabs and it was there from day one!
Especially since modern desktop environments will have a gesture or something to give you a preview of all your open windows. What's annoying is that they all seem to shuffle the spatial order of the window previews whenever they feel like it.
Because there are smarter ways to group tabs than 20 browser windows.