Wording of that message is?

The information you have entered is to be sent over an unencrypted connection and could easily be read by a third party.

Are you sure you want to continue sending this information?

Tools > Options > Security - Warning Messages = Settings...

un-check - I leave an encrypted page for one that isn't encrypted.

thanks for your reply. however, that option was unchecked already. any ideas????

That is the PostToInsecureFromInsecureMessage:

"The information you have entered is to be sent over an unencrypted connection and could easily be read by a third party"

I think that it is this one: I submit information that is not encrypted (security.warn_submit_insecure)

the only one I have checked is the second option - all others are unchecked.

"Tools > Options > Security - Warning Messages = Settings... " Where is this setting located in FF ver 5.0? I cannot find it.

The settings for the warning messages have been removed from the user interface (Bug 513166).

You need to change the related security.warn_* prefs directly on the about:config page.
Filter: security.warn

To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.

• Use the Filter bar at to top of the about:config page to locate a preference more easily.
• Preferences that have been modified show as bold(user set).
• Preferences can be reset to the default or changed via the right-click context menu.