Referrer Spoofing

MultiZilla was the first browser add-on to include referrer spoofing. The reason for implemented this feature was simple, privacy. Lets have a look at the current referrer:

  • Warning:
    Your browser appears to forward the wrong referrer so you won't see the images on this page — disabling the referrer spoofer and re-loading this page should show two images that are now missing.

We have setup a small example of referrer checking on this page. You will not see the menu image while using a fake referrer. We only check the referrer for /multizilla/ on this page but that can easily be changed to whatever you need.

What is the referrer?

The referrer is basically the webaddress i.e. the URL from the website or webpage you visited before you came here.

Why check the referrer?

The main reason for websites to utilize referrer information is to secure their images, movies and music. This way they can prevent other people from Hot Linking to their content. Which can get pretty expensive. Especially for privateers and small companies with a limited amount of bandwidth.

Just think about this; Every image, movie and even your HTML and CSS will cost you money when other people link to it. Hot Linking without permission is not just “Not Done” but also highly unethical.

Who checks the referrer?

Well that's not hard to tell, sites that need to protect their content will use it. Aduld sites are a big booming business on the Internet, so they might want to prevent others from stealing their content from the site.


Not all sites are fully functional when you setup referrer spoofing so you must disable MultiZilla's referrer spoofing for websites that refuse to work with fake referrers.


The MultiZilla implementation does not support a per site referrer spoofer. We expect this to be implemented in a future upgrade of MultiZilla — which unfortunately never happened, this due to the lack of demand for it.