Firefox won't work but Safari will???

Firefox won't work but Safari will?
Firefox was already loaded on my macbook pro but won't work??

Firefox doesn't come preloaded on new Mac's.
So you must have gotten this machine used and the person set up Firefox with a proxy amongst other "tweaks" that your not aware of, possibly even remote access to your machine.
If this is a used machine you bought, ideally it would be best to backup any files you have to a external drive, c boot off the installer disk the other person should have given you and use Disk Utility > Erase > Zero and format the drive HFS+ Journaled. Quit and install OS X and start with a fresh machine.
If you don't have the disk, a $29 Snow Leopard install disk is avaialble from Apple (no iLife programs, sold seperatly) which you can do the same as above.
If you don't want to do this, then delete Firefox and it's Library > Application Support > Firefox folder and reinstall it fresh from Mozilla.
Just reinstalling Firefox alone doesn't work, the support files need to be trashed as well.

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