Ask Me Help Desk - Non-secure form warning

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Non-secure form warning

I have a 1 year old iMac, OSX 10.8.5
Use yahoo.com for email
I have been away for 3 weeks. Now this message pops up constantly:

"This form will be sent in a way that is not secure. Are you sure you want to send it?
Cancel Send"

What is happening and what should I do?

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