Feature: Tab Groups/Stacks
I was wondering if you would consider implementing a tab grouping/stacking feature, similar to the Vivaldi web browser. It's a feature I sorely miss in Firefox, as it is great for tab organization.
It doesn't need to be as complex as tree-style tabs, just simple grouping.
I would work on it myself, but I'm not really familiar with how Javascript does things, or the Web Extension framework.