normally the error dialog will name the script in question and give you the exact line in there that is causing the issue - so you could inspect it yourself if something unusual which might be requiring lots of cpu is going on there.

Warning Unresponsive script - What it means and how to fix it

The point is, it works in release 19 and not in release 23 and there's no indication in the error dialog. It's a Firefox bug.

Generic replies like yours are no help and discourage people who could help from replying.

Please update the Flash plugin because the currently installed version is seriously outdated and has known security vulnerabilities.

• Shockwave Flash 10.0 r22
• http://www.mozilla.org/plugincheck/

Does it mention a specific script?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

In Firefox Safe mode these changes are effective:

• all extensions are disabled
• the default theme is used (no persona)
• userChrome.css and userContent.css are ignored
• the default toolbar layout is used (localstore-safe.rdf)
• the Javascript JIT compiler is disabled
• hardware acceleration is disabled

• plugins are not affected
• preferences are not affected

without any details on the issue, what else would you expect than a generic reply..?

The problem went away after doing a Reset - presumably something is left in the wrong format when Firefox does an self-update.

I have the same problem as well and doing a Reset does not fix it.

the problem is the flash player, not firefox. To fix the problem:

1. to go to a website that have a flash video, such as youtube 2. right click on the video then select "global settings", this will open up the flash player setting manager 3. click on the advance tab 4. under "browsing data and settings", click "Delete All".

that is it , u will notice firefox wil run smoothly once again. if after some time firefox slow responding again, just do the same thing to fix it. goodluck!!!