https://www.requestpolicy.com/
Firefox addon for privacy and security - RequestPolicy by Justin Samuel
Open source Firefox extension to control cross-site requests.
privacy and securityfirefox addonrequestpolicyjustinsamuel
https://reviewers.addons.thunderbird.net/en-us/seamonkey/addon/requestpolicy/
RequestPolicy :: Add-ons for SeaMonkey
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure...
add onsrequestpolicyseamonkey