That's a bit similar to the way I did it way back when Firefox came out. One of the early window managers that supported this, probably pwm. And it does work quite okay as a simple tab substitute for most applications.
For browsers, I would need some kind of hierarchy support, though. A bit harder to do in a window manager, but then you'd have it for all kinds of applications. Maybe even combine it with some additional exposed information -- so without support you manager your hierarchy yourself, but if there's an easy way to get a buffer list, the top-level would be from the wm, and the second level from that list.
I would need some kind of display for a browser, though. I'm fine with on-demand buffer lists in editors (and actually turn off sidebars when I use Sublime), but for my browsing habits I'm better off with a list that's always visible.
For browsers, I would need some kind of hierarchy support, though. A bit harder to do in a window manager, but then you'd have it for all kinds of applications. Maybe even combine it with some additional exposed information -- so without support you manager your hierarchy yourself, but if there's an easy way to get a buffer list, the top-level would be from the wm, and the second level from that list.
I would need some kind of display for a browser, though. I'm fine with on-demand buffer lists in editors (and actually turn off sidebars when I use Sublime), but for my browsing habits I'm better off with a list that's always visible.