

Optional: In the Search Box on the about:config page, paste, double click the setting to change it to " true", this will enable autofill. If you also want to restore autofill functionality, so that your saved login/password automatically populates in an HTTP form, keep the configuration page open and follow the next step.

click the padlock or 'i' icon in the address bar, then the '>' button, then More Information, and finally the 'View Certificate' button. (menu bar) Tools > Page Info > Security > 'View Certificate'. The default value of false prevents the Firefox web browser from filling out form information on HTTP pages. right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > 'View Certificate'.


You need to modify another preference of the Firefox web browser for that. Toggling the preference won't have any effect on the automatic filling out of forms on HTTP pages. If you set it to false, those warnings are not shown. The default value of the preference is true, which means that the feature is enabled and that Firefox will display warning prompts when you activate insecure login fields.
