Benjamin, spot on! The number of notifications for Firefox downloads seems to be the exact same number as open windows. One has to have both notify-osd and notifcation-daemon packages installed for this bug to appear.
The number of notifications in network-manager differ from this and seem to follow their own rules. -- firefox shows three pop-up notifications per completed download https://bugs.launchpad.net/bugs/540630 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs