Not sure if you know but in Lion to get to your Library folder you need to go to the Go menu in the Finder, hold down the Option key, and Library will then show up in the list.
I knew that but couldn't find a FF folder.
That's the wrong Library folder, that's the global Library folder. The one that you're looking for is hidden, Apple made the individual user's Library folder invisible in 10.7 and above. That's why you have to use the Go menu routine that I mentioned above. I guess they were trying to protect us from ourselves, but it just makes it harder to troubleshoot as you can see.
The path for the one you're looking for is in Macintosh HD/Users/your name/invisible Library folder.
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