I know I can disable
Network.http.sendRefererHeader to 0 in
about:config, and using the RefControl extension I can set it on a per-site basis (or using wildcards, e.g.
*.org). Is there a way to set this to a certain website, e.g.
Install the Modify Headers Firefox extension. In the extension's Preferences dialog, click Select Action and click Add.
Enter Add as the action, type
Note that some webpages may not work properly because they expect the referrer to be a certain value. To test this out, visit whatismyreferer.com.