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Re:The New Firefox and Ridiculous Numbers of Tabs by Manishearth on Friday July 21, 2017 @08:26PM (#14824728)
There's a new Tree Tabs that works on 57 FWIW

https://addons.mozilla.org/en-US/firefox/addon/tree-tabs/

not as nice as the old one (but it's improving!), I just use Tab Center Redux.

Re:The New Firefox and Ridiculous Numbers of Tabs by ZenoArrow on Sunday July 23, 2017 @04:37AM (#14831414)
There's also talk of implementing Tree Style Tabs as a WebExtension. It appears the required APIs have been approved, they're just waiting on someone to implement them:

https://github.com/piroor/treestyletab/issues/1224