Hello Brenda.

This is an issue with your operating system. Well, it's not so much an issue as it is a setting. Simply updating Firefox in an administrator account should fix it. In Windows, this sometimes happen when users aren't running admin accounts, or are not running Firefox as Administrator.

Hope this helps.

See http://kb.mozillazine.org/Installing_Firefox#Mac_OS_X ..... Download a new copy of the Firefox program: http://www.mozilla.com/firefox/all.html Trash the current Firefox application to do a clean reinstall. Install the new version that you have downloaded. Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data.

I resolved the problem in Snow Leopard by logging out of my (admin) account and logging into my daughter's account on the same machine. She doesn't have admin privileges, so when I tried to install Firefox 4 in her account, I had to authenticate with my admin identity and PW. Installation went smoothly after that. My guess is that you could also simply create a new account on the same machine and install Firefox 4 from that. I have no idea why this works.