Why do i get a dialogue box appear before Firefox 4 will load?

When i turn on firefox 4 I get a dialogue box appear which says, Java Script Application. Type error:Components.classes [cid] is undefined. Ideas please

Probably caused by an incompatible extension.
Do you have that problem when running in the Firefox SafeMode?<br/> ''A troubleshooting mode.''<br />
1.You can open the Firefox 4.0 SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut. <br />
2. Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running. <br />
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut to open it again.''
If not, see this: <br />
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes

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