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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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I don't get their allure. Why not Tree Style Tabs? You can create "groups" and endless subgroups. Also, no need to scroll horizontally, which takes way longer to find stuff, just scroll vertically or collapse trees.
Tab groups seem inferior to tree style tabs.
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Tab groups for the friendly name at the top of a set. Edge implemented vertical tabs. Not as good as tree, but better than across the top.