Javascript application error message? syntax error

I am getting a pop up error message continuously when using firefox 10,7.5 and prior versions,
"Javascript Application Error:
syntax error:
It demands I click on "OK" button to proceed.
How do I fix this problem?
thanks
linniek
or
[email protected]

The Social Fixer extension has been reported to cause this issue.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Javascript application error message? syntax error

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