Does that mean web pages stay active even when Im in the OpenGL-based VR view?
Yes. Anything shown or playing on a web page remains active even when you switch views. This is handy if, say, there is a soundtrack on the page which you might want to hear while panning around the VR in fullscreen. VRWay’s spectacular series of Basilicas are a good example of this. Going to Slideshow Setup -> Music and clicking the music preview button starts a track playing but the music doesn’t stop playing when the setup box goes away, even when I’m not viewing a slideshow. Is this a bug? It’s a feature, not a bug, to let you play music while you pan.