Pomodoro Bookmarklet (powered by Google timer):

1. Create new bookmarklet

2. Name: Pomodoro

3. URL: javascript:window.open("https://www.google.com/?gws_rd=cr#q="+((document.title.index...)?"":"2")+"5+minute+timer&safe=off",'_self');

4. Save

Click on the bookmarklet to toggle between "Work" and "Break" mode.