Since it's been two years since the last Bitcollider release, it's safe to say we won't see a fix for the Mozilla problem any time soon. Firefox is affected too. Here's the workaround for any browser (in Windows XP):

Run Bitcollider and have it process a file. Keep Bitcollider open after it's done processing.

You'll now need to open a LOCAL file, as in a location on your hard drive. In Firefox and in most other browsers, you can do that by clicking File -> Open File.

The file you want is located at: C:/Documents and Settings/(your windows username)/Local Settings/Temp/bitprint.htm . Simply open it in your browser and it will already contain all the data that Bitcollider gathered for the file you processed, and after about 2 seconds it will automatically submit the info. You'll then see the Bitzi page for it and you can rate the file etc.

This file (bitprint.htm) is created and replaced whenever you process a file in Bitcollider. You will need to open it every time you want to submit a Bitzi report, so it would be wise to create a bookmark to it in your browser, or a shortcut on your desktop.