Use Google Chrome and Chromium "Preferences" file to permananently disable referrer headers. http://darklaunch.com/2011/08/24/disable-a-referring-url-in-chrome-and-chromium
Google Chrome and Chromium send referring headers when you click on a link, submit a form, etc. To disable this "feature", run Chrome or Chromium with the "no-referrers" option.
Allowing Referer Headers
Using the default settings of including referring information may present a privacy/security risk. Requests to web pages may include this information as part of the HTTP Protocol and it tells what page you came from -- this additional information may also be used to track you.
Available Chromium Switches
The full list of available chromium switches is listed here under: "Don't send HTTP-Referer headers"
Firefox send referer header setting
In Firefox, the option is available in about:config under "network.http.sendRefererHeader" and you want to set this to 0.
- 0 - Never send the Referer header or set document.referrer.
- 1 - Send the Referer header when clicking on a link, and set document.referrer for the following page.
- 2 - Send the Referer header when clicking on a link or loading an image, and set document.referrer for the following page. (Default)
The referring url is available from the document.referrer field.