Perform the suggestions mentioned in the following articles:

• Clear Cookies & Cache
• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
• Warning Unresponsive script - What it means and how to fix it
• http://kb.mozillazine.org/Unresponsive_Script_Warning
• Update All your Firefox Plugins -> https://www.mozilla.org/en-US/plugincheck/
  • When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)

Check and tell if its working.

I have tried all of the suggested remedies. Nothing seems to work. The Fireftp add on takes about 20 seconds or more to display. The script notice is about 20 seconds or less. I was not able to find out how to increase the time of the script notice. Any suggestions. I have 2 computers and the script notice appears on both. The computer with the smaller file gets many fewer script notices. Script: chrome://fireftp/content/js/local/localTree.js:134 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.

Try updating your add-on:

• Check for new versions of your add-ons

Check and tell if its working.