Firefox Right Click Problem

[LASTGUY2GETPS2]

I've reinstalled, etc.

Whenever I right click anywhere on a webpage I get this annoying error:

http://img502.imageshack.us/img502/1362/error9fr.jpg

Any idea how to fix?

Answers that are no good:
Move to another browser (ie, IE, Opera, safari, etc.)

 

[LASTGUY2GETPS2]

NM, turns out it was the Extention Downloadthemall that was causing the trouble.