Using Firefox in Ubuntu, I often get a Javascript error message that says evalinSandbox:SyntaxError:syntax error. How can I fix this?

It happens on most, but not all, of the pages I visit. After closing the error message, another one pops up saying "Error: Syntax Error." Closing this window will bring up the initial error message again, and the process repeats five or six times. Eventually the windows will stop popping up and I will be able to view the website, but as soon as I go to another webpage the error messages start again. I've updated both Firefox and Ubuntu to the most recent versions.

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