How can I reinstall FF? I tried to upgrade to FF4. Now I can not open FF at all. Please help!!!

I tried to upgrade to FF4. When I dragged the icon to my applications folder it had a circle with a slash through it. The new version replaced my previous 3.6... version and now I can not open FF at all. Instead of opening I get a msg saying "The app FF cannot be launched -10661" Please help!!!
I need to reinstall FF but I am concerned that if I scrap FF4 I will lose all my bookmarks & add-ons. I am a web designer. Hope you can help.

You supply little pertinent about the MBP and the iPhone.
First... on the MBP... Click on the Apple icon.. Top left in Finder...
 > About this Mac > Version...what does it say?
Which iPhone and what is its' iOS Version.

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