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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
(www.ghacks.net)
A place to discuss the news and latest developments on the open-source browser Firefox
Finally!! I've been waiting for this so I can officially ditch edge
I use edge at work, and it does vertical tabs better than Vivaldi. I really hope to see this feature in more desktop browsers.
Just install Tree Style Tabs?