Not updating, last was 2009, prefernce update boc checked, but grayed out so can't fix it, how to do it?

I want to sync my firefox browsers between computers Current version on my iMac hasn't updated since 2009 ???? When I try to get it to update, the Firefox box in advanced window is checked but greyed out so I can't do anything to adjust it. How do I upgrade to most recent firefox version without losing all my passwords, etc. why has the box been checked but I'm locked out of it,

Echoing Kurt, since you're a newcomer to the Mac, see these:
Switching from Windows to Mac OS X,
Basic Tutorials on using a Mac,
Mac 101: Mac Essentials,
Mac OS X keyboard shortcuts,
Anatomy of a Mac,
MacTips,
Switching to Mac Superguide, and
Switching to the Mac: The Missing Manual, Lion Edition.
Additionally, *Texas Mac Man* recommends:
Quick Assist,
Welcome to the Switch To A Mac Guides,
Take Control E-books, and
A guide for switching to a Mac.

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