Please, update addon to latest version. Key switching was added
Ctrl+1 - prev group
Ctrl+2 - next group

and up, down, left, right on popup

You can load Youtube or music players in other windows (other groups) and switch groups thought keys without closing tabs :)

Upd:
Please, update addon to latest version. In latest version I added option to fast switch groups and auto load only active tab, not all tabs.

Thanks for your feedback!