From MozillaZine Knowledge Base

Firefox will display an error dialog titled "The page isn't redirecting properly" when a webpage redirects you in an endless loop.

This article describes a few things that you can do to stop these errors.

Turn cookies on

Firefox must be set to accept cookies from websites.

In Firefox:

• Go to "Tools -> Options -> Privacy -> Cookies"
• Make sure "Accept cookies from sites" is checked.
• Make sure the site you're trying to access is not in the Exceptions list.

Clear cookies

You may have data in your cookies that the site doesn't expect. To clear this data:

In Firefox 1.5:

• Go to "Tools -> Options -> Privacy -> Cookies"
• Click "Clear Cookies Now"

In Firefox 2.0 and above:

• Go to "Tools -> Options -> Privacy -> Cookies -> Show Cookies..."
• Click "Remove All Cookies"

Enable referrer information

Check that network.http.sendRefererHeader is set to 2:

1. Type about:config in the Location Bar
2. Press Enter
3. Find the preference name network.http.sendRefererHeader
4. Double click on it. A dialog will appear.
5. Enter 2 into the dialog.
6. Press OK.

Bad website

The problem could simply be an error in the website's coding. Contact the webmaster for assistance.