Mozilla Firefox includes a Mixed Content Blocker. This Mixed Content Blocker is enabled by default and protect users from man-in-the-middle attacks and eavesdroppers on HTTPS pages.
Mozilla classifies Mixed Content into two types – Mixed Active Content like scripts, and Mixed Passive Content like images. The former is considered to be dangerous, as it can alter the behavior of an HTTPS page and steal sensitive data from users – hence it gets blocked by default in Firefox.
Now, whenever you user visits an HTTPS page with blocked Mixed Active Content, you will see a notification with the following message:
Firefox has blocked content that isn’t secure.
It will display a shield and offer the following options: Learn More, Keep Blocking, Disable protection on this page and Not now.
Selecting Disable protection on this page will allow Mixed Active Content too, but Firefox may or may not remember your settings, the next time you visit this site. Moreover if you see this message on your trusted sites often, it may irritate or annoy you, and you may want to disable this default security setting.
Disable Mixed Content in Firefox
To disable mixed content warnings in Firefox on your Windows 8, open Firefox, enter about:config into address bar and hit Enter.
Using the search box, search for a setting called security.mixed_content.block_active_content.
Once you have found it, double-click on it. Its value will automatically change from True to False.
Restart your Firefox browser.
But mind you, this will make your Firefox browser a little less secure!
Internet Explorer users may want find out how they can disable active content.