Rated 5 out of 5 stars
Out of all the addons on addons mozilla org website this is the ONLY one that has the "timer"/"stopwatch" functionality, and is using up to date technology.
I got lucky and "every minute" was exactly what I needed, however we should be able to tune it too Every X. Maybe with a nice GUI to set it, like on iPhone applications.
The notifications also go away after like 15 seconds, if possible can you make it so the notification does not go away until dismissed?
My timer also starts at an offset like other revies. Except mine starts at 15:00:00.