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clearHTTPStatus 126.96.36.199-signed.1-signed Requires Restart
Prevents abusing of HTTP status code.
1. It works in the background and does not need any user interaction.
2. Prevents a malicious site from performing a cross-domain discovery of the sites current user logged in.
This add-on has been marked as experimental by its developers
About this Add-on
For example, HTML SCRIPT tag fires "onload" event if HTTP response from a victim server contains a 200 HTTP status code. And fires "onerror" event if the HTTP response from victim server contains one of 403, 404, 406 or 500 HTTP status code.
This attack was discovered by Mike Cardwell.
Above link provides good explanation of HTTP status code abuse with the help of examples.
The sole aim of this extension is to prevent an HTTP status code abuse to protect a user privacy. This extension works in background and does its job. It doesn't need any user interaction.