A script on this page may be busy firefox jquery

In Firefox, when I loaded a page, it showed ""A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete." I need to click continue or stop. To fix this unresponsive  script:
1) In the address bar, type about:config and press Enter.
 about:config
2)  Click I'll be careful, I promise! to continue to the about:config page.
3)  search for the preference dom.max_script_run_time, and double-click on it. In the Enter integer value prompt,
change 10  to 40.
4) Press OK.