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Firefox Sidebar and Vertical tabs: try them out in Nightly Firefox Labs 131 – Firefox Nightly News
(blog.nightly.mozilla.org)
This is a most excellent place for technology news and articles.
Vertical tabs are what kept me on Microsoft Edge for the longest time (alongside that surf minigame that can be played offline), but I'm not a fan of that thing anymore so... Firefox it is.
Please bring me vertical tabs.