Anything I type in the search bar always sends me to the Win Amp page
Each search I perform always sends me to http://www.winamp.com/ as soon as I hit enter, regardless of topic, I even can type in "anything" hit enter and I get send to http://www.winamp.com/.
Alla svar (2)
Try start Firefox in safe mode, sometimes this problems are caused by addons
Also try scan your PC:
Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs each time you start Firefox.
The user.js file is only present if you or other software has created it, so normally it wouldn't be there. you can check its content with a plain text editor if you didn't create this file yourself.
The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.