Firefox Problem with Streaming Audio

[chazdg42]

My first problem with Firefox after using it for over a year! Anyway, I installed Foobar to try it out. I opened a Winamp audio stream using Foobar with no problem. Subsequently, I decided to go back to Winamp and removed Foobar. Now I am unable to open an Winamp media stream in Firefox 1.0. The "ok" button is greyed out with the only choice to cancel. By the way, the file is a mpg64.pls file. How can I fix this problem? Is it a plugin issue? The Firefox forum hasn't been much help. Thanks for your help!