Please see this article: http://reviews.cnet.com/8301-13727_7-20082044-263/os-x-lion-where-did-my-library-go/

If this answers your question, please click the Solved it button next to this post after you log in into the forum. This will help others searching for a solution to the same subject.

Thanks.

Help > Troubleshooting Information > Profile Directory: Open Containing Folder

• http://kb.mozillazine.org/Profile_folder_-_Firefox

@ co-rel, that link is no longer valid because the Profile location on MAC OS X Lion has changed.

Thank you very much, Xircal. It works!

You're welcome.

The Library folder is now only a hidden folder, just like .mozilla on Linux and AppData on Windows.
Mac users will need to get used to browsing to hidden folders.

In Mac OS X v10.7, the $HOME/Library folder is a hidden folder.
Open Finder and use one of these:

• Use Go -> "Go to Folder" (Shift-Command-G) and type: ~/Library
• Open the "Go" menu and hold down the Option key to make the Library appear

You can also use this command in a Terminal window to remove the hidden flag.

• chflags nohidden ~/Library

put your pointer(arrow)to the very top of the screen for a couple of seconds and the menu bar will drop down (because it is now hidden).