Earlier quoted context omitted.
What's wrong with a fixed tab bar? Like the one in Chrome?
There's nothing inherently wrong with it, but it doesn't work well once you get beyond a certain number of tabs (the number will vary depending on your screen size, etc., blah). At some point, all the tabs are scrunched down to being indistinguishable blobs. Firefox, at least, doesn't have that issue, thanks to the scrolling tab bar. And the drop-down that shows all your tabs is, to me, a sufficient answer to the "my…
I don't know what you're on about. I opened the maximum number of tabs that my browser window can have visible (~90) and at no point were they indistinguishable blobs. Every single one still had a favicon.