Vertical/Tree-Style Tabs

1

Most web content is vertically oriented (especially since sites these days are formatted with phones in mind) and monitors are horizontally oriented. So where’s the best place to put browser tabs? On the side, right? So why are they all on the top?

Firefox version 57 finally killed addons that supported vertical tabs. So it looks like I’ll be staying with version 56 for the foreseeable future. (“Tabs” in a sidebar while keeping the top tabs just doesn’t cut it.)

I know I’m not the only one on this forum that employs numerous browser tabs. What do you do about it?

No, sir.  I don't like it.