Some Extension Messing w/ Firefox

[yellowjack]

I went here: http://music.aol.com/songs/newsongs.adp

And tried to listen to the "Editor's Picks". I downloaded an extension (for Java, I think) and it didn't work, i.e. all play buttons showed the javascript:void,null so I tried on MSN Explorer and it's worked.

Back on Firefox, some webpages aren't displaying correctly. For example, on http://www.fullcontactpoker.com , it shows the menu, the ads, and the blog entries below that across the entire width of the screen. There are no graphics on the webpage except the images of FCP clothing at the Oakley ad. The background is still a plain white.

Did I really f--k up the Mozilla Firefox browser by installing the extension? What do I do?

[StevieG]

Very easy to find out. Go to the Tools menu, select Extensions, and uninstall what you installed.

[yellowjack]

It's not there. I installed it once, it finished, but then it didn't work. Ii went to install it again and apparently it didn't work the first time. Didn't work the second time either. I can't see the extension. /images/graemlins/confused.gif

[StevieG]

What did it try to install?

[yellowjack]

I think it was some Java extension.
Posting in Firefox Support Message Board as well.
Thanks for trying to help.