title: How to remove incompatible extension of Firefox?
body: <p>The Java extension was installed in the old version of Firefox, it become incompatible when Firefox updated. I want to remove it but there isn't a button for this operation. Is there any way to remove it or to fix it?</p>
  
  <p><img src="https://i.stack.imgur.com/Fhtht.jpg" alt="enter image description here"></p>