Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
For sites with Extended Validation status (sites that have a green identity button), in addition to the padlock icon, a small passport icon will be shown.
It is possible to always display a warning icon (for example an open black padlock) whenever no security is being used.
It is possible to enable background highlighting for the location bar.