[fayten]

I don't really think anyone is copying anyone here. This is a popular feature for browsers that has been around for over a decade.

Orion[1] is another recent MacOS browser that released before Arc in 2021 and has vertical tabs. Edge had vertical tabs as an experiment back in 2020[2] and is full feature now. Vivaldi has had vertical tabs since 2015[3]. It might not count since it's not built in, but Firefox has had vertical tab extensions since 2007[4].

[1]https://browser.kagi.com/

[2] https://www.howtogeek.com/697986/how-to-enable-and-use-verti...

[3]https://www.maketecheasier.com/vertical-tabs-browsers/

[4]https://github.com/piroor/treestyletab/graphs/contributors