Top right of my tab bar in firefox, there is a little down pointing arrow. I click that: BOOM vertical tabs. Now make it an optional fixed thingie and let me stack them. I may be missing something here, but that sounds like something an experience Firefox dev can implement in half an hour.
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You mean the thing that Opera had in the 90s, and Vivaldi since inception?
It's better to integrate Tree Style Tab addon instead. It's not a good idea to re-implement a function which already has a great implementation...