From Softlea Development:
FireFox Detective Plugin for Wordpress determines if a user is stuck with IE and sends the download icon for Firefox automatically. Very easy to use, simply put it in wp-content/plugins. activate it. If you use Firefox you won't see anything, if you use IE you get the 180x60 download button for Firefox. This version is the first release on CNET Download.com.
What's new in this version:
This version is the first release on CNET Download.com.