This could make some things easier but also will cause more lag for those with lower end PCs and bad WiFi. When I am on a PC I usually just right click an alert and just put it in a new tab, it makes it a little easier.
Support (As I've seen in previous comments, lag 'may' be a problem for this, so if it is, maybe make this a feature users could just choose to enable or disable.)
I give support because I can see how this would make some people's lives easier, but if there was a way to disable it that would also be great :P