This is exactly what I've been looking for a while: some way to toggle start/stop time of the task with just a click of a button. I'm not really a Redmine user, but this add-on made me install it, because this is EXACTLY what I was looking for for some time to record what types of internal tasks (like meetings, consultations, answering "just a quick questions" etc.) take what ammount of my working time. Great job! You totally deserved a contribution.

May I suggest some improvements for future releases:
1. Option to group Projects in some sort of nested hierarchy.
2. Option to choose size or resize the projects' buttons. I have 16 Projects already on the window and it takes quite a bit of space.
3. Option to enable/disable "Ask fr text..." option per-project.
4. (A really advanced one, but really neat) Make "comment" field embedded in Project's button, so that it appears already when you toggle Project 'on' and goes automatically into "Spent Time" comment when toggled 'off'.

I like it

Awesome, this is really what I am looking for for my daily work

simply is the best

UPDATE (Dec 2019): Having now switched exclusively to Firefox for dev work I gave this a try a few months ago and, although it works differently than the main Chrome Redmine Timer, it now definitely works. All the issues that I originally reviewed on have been resolved. Also, a bug in Firefox 72 which caused it to break again were quickly resolved (and the Bitbucket repo link is live and working).
If you are using Redmine for dev work within Firefox you definitely need this extension (esp. if you bill for your hours).
Changing rating from 1 star to 5.

[Original review 2 years ago]
I'd love to write a nice review (and even contribute) but without the ability to save my redmine URL or api code, and (worse yet) no apparent way to contact the developer (bitbucket link is dead) I guess it gets zero stars. Although it has been recently updated, looks like no reviews for several months, so not sure if anyone else is able to get it to work either). [Firefox 56.0 64-bit on Win10]