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Pinned Tabs - keep favorite websites open and just a click away
(support.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
It works great in combination with the keyboard shortcuts for opening the first, second, ... eighth tab, which is Alt+1 (or +2, +3, etc.) for me, but I think is Ctrl or Cmd instead of Alt on other OS's.
nice! but I hate that I cycle through tabs with CTRL and have to switch to Alt for pins.