Usage Counter
Usage Counter 0.2 for Windows
Alexander Browser & Email / Browser Tweak
Usage Counter tells you how much time you have spent using Mozilla Firefox.

Software Summary:

You can run Usage Counter on Windows operating systems. Usage Counter is a software product developed by Alexander and it is listed in the Browser & Email category under Browser Tweak. Usage Counter is a free software product and it is fully functional for an unlimited time although there may be other versions of this software product.

Alternatives in Browser & Email on Windows