Review for Mailbox Alert by sejtam
Rated 4 out of 5 stars
It woudl be nice if the add-on could also provide a volume control for the alerts, so that one can mute all (or specific) alerts to more acceptable volumes, w/o having to adjust the whole system's volume. A master volume (on a button in a toolbar) with sub-sliders for relative loudness of specific alerts would be idea.
This review is for a previous version of the add-on (0.13.1).To create your own collections, you must have a Mozilla Add-ons account.