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Looks like a ton of similar extensions exist for Chrome as well. https://chrome.google.com/webstore/detail/tabs-outliner/eggkanocgddhmamlbiijnphhppkpkmkl?hl=en

• slavak 8y ago
  Chrome doesn't support the APIs needed to make a full Tree-style Tabs replacement. Anything that attempts to do it by necessity runs in a separate window disconnected from your browser. So it's there, but it's nowhere near as seamless and convenient as it is in Firefox.
• _coveredInBees 8y ago
  As @slavak mentions, Chrome APIs are far more hobbled and every tree-style implementation I've seen has been glaringly deficient in comparison to Tree-style-tabs on Firefox. TST should be the way all browsers handle tabs, especially considering that vertical screen real-estate is far more expensive. I've been using it for 6+ years and can't imagine browsing any other way.