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Re:The New Firefox and Ridiculous Numbers of Tabs by nxc18 on Friday July 21, 2017 @08:53PM (#14824826)
Edge has this since Creators update. Unfortunately, Edge is pretty bad in ways that actually matter (UI responsiveness, reliability).
Re:The New Firefox and Ridiculous Numbers of Tabs by bigbugbag on Saturday July 22, 2017 @05:28AM (#14826214)
Edge is useless outside of recent windows version.
Re:The New Firefox and Ridiculous Numbers of Tabs by int_19h on Sunday July 23, 2017 @03:14AM (#14831216)
Vivaldi has tab groups, and lets you put the tab bar on the side (where it becomes kind of like a tree).

https://help.vivaldi.com/article/grouping-tabs/