To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Rated 5 out of 5 stars
Please prepare for Firefox 4 (b4 or b5). Starting from 4.0 b4pre, Gmail Checker no longer works (failed to log in).
But it works well on 4.0b3pre.