Comment 90 for bug 501393

3 ideas :
- Ubuntu displays Firefox notifications in Notify OSD (so removes the action callback in exchange of a nicer notification). xul-ext-notify package seems to allow this.
- Ubuntu creates a 2nd notification system, complementary to Notify OSD, which provides action callback support and would be embedded in the browser window
- Firefox provides a way to customize/skin the appearance of its notifications, in order to better integrate them in Ubuntu.