What is your computer system and Firefox? What is the full error message? What website is this happening? What were you doing at the time? '''https://support.mozilla.org/en-US/kb/warning-unresponsive-script''' ---------- Hello, In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see [[How do I create a screenshot of my problem?]] Once you've done this, attach the saved screenshot file to your forum post by clicking the '''Browse...''' button below the ''Post your reply'' box. This will help us to visualize the problem. Thank you!