Auto-fill, used by hundreds of websites, invisibly captures each piece of information as you fill in online forms. As soon as you have typed or auto-filled anything into the online form, even if you close the tab prematurely, edit your information, or never click the submit button, the website has already retained your information.
Disable Auto-Fill, It’s Leaking Your Information!
In order to protect yourself from such websites collecting your data without your consent, you should consider disabling the auto-fill form feature.
Click here to read the entire article, which includes instructions for disabling auto-fill.