Constant Google popups

If you constantly get a popup that says, "To view this page, you must log in to this area on mail.google.com:443:" when logging into your Google account, follow the instructions below the illustration

open Keychain Access (Applications => Utilities => Keychain Access) Select Passwords on the left.
Delete your Gmail keychain.  Also, if you have any Google related extensions (Google Toolbar, Google Notifier, etc) and your password gets deleted, you may get this popup.

If you not want this behavior, delete your Google add-on.  If you have the Google toolbar installed, open your preferences in Safari and click on Extensions.  Click on Apps on the left and uncheck Gmail