My client has a donation form at https://aleh.org/donate-online/
. We enable the HTTPS using the plugin WordPress HTTPS. The donation form is via HTML code, and goes to another page to be processed before being sent back to the thank you page.
When the SUBMIT button is pressed, the user gets this error in firefox:
Although this page is encrypted 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.
I don't know why they get it and how to correct (or work around) this error.