Ever since I downloaded Firefox 4 (and now Firefox 5), I get two error messages when the auto-update tries to run.

The two messages are as follows: "Something is preventing Firefox from updating securely. Please make sure that you have the latest version of Firefox from: http://www.firefox.com " and the second message, "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help." I have made sure that I have the newest version of Firefox, downloaded from cnet.com. Can anyone explain this problem?

Try to trash the current Firefox application and do a new installation.
* Download a new copy of the Firefox program and save the DMG file to the desktop
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Trash the current Firefox application to do a clean (re-)install
* Install the new version that you have downloaded
Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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