Unresponsive Script Warning

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When JavaScript code runs for longer than a predefined amount of time, Firefox will display an Unresponsive Script error. This time is given by the settings dom.max_script_run_time and dom.max_chrome_script_run_time.

Finding the source of the problem

To determine what script is running too long, open the Error Console and tell it to stop the script. The Error Console should identify the script causing the problem.

Extensions

If you get the Unresponsive Script Error on many different web pages, the problem is most likely a recently installed extension.[1]

Websites

If you get the Unresponsive Script Error on a specific web page, it could be a problem with the JavaScript on the web page. You may want to contact the webmaster of the site to inform them of the problem, or you may wish to file a Tech Evangelism bug report.

References