Good... Question Rated 4 out of 5 stars

Very Nice!!!

Is it possible to change H:MM to H:MM:ss or MM:ss?
Thanks =)

This review is for a previous version of the add-on (0.4.12). 

Thanks for the review. I decided to only show minutes and not seconds in order to keep the add-on lightweight and not impact browser performance. Updating by the minute is much simpler and lighter than updating every second. Also, I thought it made sense to measure the time spent by minutes and not seconds. (Note: it still keeps accurate time, to the second, but only updates the ticker by the minute.)