title: Install a personal firefox web extension permanently
body: <p>Previously, I could write an addon for personal usage packed as <code>something.xpi</code> and I clicked on it to install it.</p>
  
  <p>After a while, mozilla introduced <code>xpinstall.signatures.required</code> which you could still get around it.</p>
  
  <p>However, it did not stop stabbing developers who are interested to have a personal addon isolated from the world. Today, only <code>web extensions</code> are working and my XUL based addon is thrown away. The tutorials only talk about temporary installation of a web extension while I want my one runs on firefox forever.</p>
  
  <p>Beside whether I can use web extension to write into files or create a GUI in an independent page, I have a bigger challenge:</p>
  
  <blockquote>
    <p>How can I install a local web extension <strong>permanently</strong> without creating a Mozilla account for personal usage?</p>
  </blockquote>