Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News

Mozilla released a standalone Firefox Nightly test build recently that includes support for vertical tabs. Here is how it looks.

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My dream would for this to at least have an option for collapsable tree-style tabs. That's what I'm missing the most from the Edge implementation. Even "normal" vertical tabs struggle when you have over a hundred open tabs.
- You can group/collapse in Vivaldi

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