Clicking web app icon in unity shakes the firefox icon instead of focusing the web app

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http://askubuntu.com – I assumed that if a web app is installed and open in a tab (e.g. yahoo, gmail, whatever), clicking that launcher icon would focus on firefox and move to that tab. Instead of just shaking the firefox icon, ostensibly saying "you want that tab? here's where firefox is. now click the tab like normal. there's a good boy". I understand that web apps give you direct access to some features, but is this a bug, or a seemingly (to me) glaringly unintuitive functionality omission? Is there a workaround? Thanks in advance! (HowTos)