Yeah, as you say, even if it just tells if a tab is open (active or inactive), that's already a good measure of interest. But I think it may be possible to det

Yeah, as you say, even if it just tells if a tab is open (active or inactive), that's already a good measure of interest. But I think it may be possible to determine if the current tab is open with some javascript, and send that information through the websocket. Edit: what bsimpson said.