title: Firefox keeps redirecting to https
body: <p>The answers given <a href="https://stackoverflow.com/questions/30532471/firefox-redirects-to-https">here</a> do not match my problem. I accidentally landed on <a href="http://sub.domain.org/" rel="nofollow noreferrer">http://sub.domain.org/</a> which <a href="https://developer.mozilla.org/fr/docs/Web/HTTP/Status/301" rel="nofollow noreferrer">301 redirected me</a> to <a href="https://sub.domain.org/" rel="nofollow noreferrer">https://sub.domain.org/</a>. Then I changed my server config so that it does not redirect me anymore, but Firefox keeps redirecting. The Firefox console log says:</p>
  
  <pre><code>GET http://sub.domain.org/            [HTTP/1.1 301 Moved Permanently 0ms]
  GET https://sub.domain.org/
  </code></pre>
  
  <p>So question is: how to make Firefox forget this "permanent redirection" specifically? I would prefer not delete my whole cache.</p>