How to fix an unresponsive script error
An unresponsive script warning is a browser message that appears when JavaScript code on a web page or add-on takes too long to run. The message might look something like this.
Warning: Unresponsive script. A script on this page may be busy or may have stopped responding.
You can choose to “Stop Script”, or “Continue” from the buttons. Click the “Stop Script” button to stop the script from running. Stopping the script can prevent the browser from running out of memory or crashing.
If this problem is only happening on one page and every other page is fine, a script on that one page is likely causing your problem. Unless you’re the Webmaster of that page, there is nothing you can do to prevent this error. If this error is happening on different websites, it may be an issue with your computer or a browser add-on.
To identify the script/add-on that is causing the problem, you can try one of the following procedures.
Open the Browser Console
For a script in the web page, you can open the Firefox Browser Console, which may show what is causing the error. To open the error console, press the Alt key to view the file menu, then select Tools, Web Developer, and Browser Console, or press Ctrl+Shift+J.
In the Browser Console, look for references to a specific script or add-on that generated the error message. If you find a reference to an add-on that generated the error, you can disable the add-on to see if that resolves the error.
- How to You can disable or delete browser extensions.
Disable add-ons or run the browser in Safe Mode
To see what add-on may be causing a problem, you can disable an individual add-on and see if the error persists. You can then disable that add-on again, and attempt to disable another.
Another option is to open Firefox in Safe Mode, which disables all add-ons. If you have no problems in Safe Mode, you can safely assume it’s one of your add-ons causing the error.
- How to You can disable or remove browser extensions.
- How to Use Safe Mode to open a browser.
Debug error in script
If you’re the Webmaster or developer of the script causing the browser error, you can try to resolve this error. Review the possible causes to this error below for help on debugging the script.
- Error in a script that prevents the script or related script from successfully executing.
- Any loops in the script that don’t exist.
- Any script or script data loading from a source that is not available.
- Conflict between your script and browser add-ons.