B-O-Z is the boss!
Biet-O-Zilla is an extension that every eBay-er should have.
When the extension is installed, a menu item called Applications is added to the pulldown menu at the top of Firefox. Click on Biet-O-Zilla to run the application. Yes, application.
B-O-Z is a full-fledged application written with the XUL language. The extension displays a small detail list with some options at the top. First thing that occurs is a dialog box that asks you for your eBay user name and password. Enter your information and click Ok. After that, click on the Actions menu item, and click "Read Watched Items." This will import all of your watched items into B-O-Z. The cool thing is you get to see each watched item countdown when the auction ends.
B-O-Z also has a last-minute bidder option. Click on the Windows/Options menu item, then the "Bid" tab. You can set an interval for when the auction is about to expire and say that you want to place a bid 30 seconds (default is 30 seconds) before the auction ends. Nothing like gunning for that product that you have to have!
B-O-Z installed without any hassles and will definitely provide a lot of eBay watching functionality through Firefox and I commend the developer of the extension on a job well done.