Firefox allows you to check the identity of a Web page with a single glance. The icon in the location bar next to the address indicates which identity information is available and whether communication is encrypted:
Gray Globe
The site does not provide any identity information and communication between Web server and browser is not encrypted. Do not exchange sensitive information with such sites.
Gray Triangle
This site is from a domain that has been verified by a certificate, so you can be sure that you are really connected to the very site it claims to be. However, the site tried to load additional elements, such as images or scripts over an insecure connection. Firefox has blocked these items. Therefore, the page can look broken.
Gray Padlock
This site is from a domain that has been verified by a certificate, so you can be sure that you are really connected to the very site it claims to be. Communication with a “gray-padlock” site is always encrypted.
Green Padlock
This site completely identifies itself by a certificate that ensures a site is owned by the person or organization it claims to be. This is especially important when exchanging very sensitive data (for example when doing money transactions over the Internet). In this case you can be sure to be on the Web site of your bank when it sends complete identity information. Communication with a “green-padlock” server is always encrypted.
To view detailed identity information, click the icon of the Web site in the location bar. In the opening pop-up, click More Information to open the Page Info window. Here, you can view the site's certificate, the encryption level, and information about stored passwords and cookies.
With the Permissions view you can set per-site permissions for image loading, pop-ups, cookies and installation permissions. The Media view lists all images, background graphics and embedded objects from a site and displays further information on each item together with a preview. It also lets you save individual items.