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You can try Vertical Tabs in Firefox now
(www.ghacks.net)
A community for discussion about Mozilla Firefox.
Vertical tabs are a good feature for modern desktop monitors. I tried it on MS Edge and Brave Browser. I have Tree Style Tabs on Firefox, but the problem I have is the horizontal tab bar is difficult to remove if for it not that is make break something during an update. Not only that, but I use Nightly as my primary browser.
Yeah, I have a userchrome css to get rid of it, but it's definitely brittle over time