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What does this error mean and how can I fix it? I haven't been able to find anything out online and I get it all the time now.

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Script: chrome://fctoolbarf5f7ac0099394a6491985d4a5cf5f149/content/fctoolbar.js:5

Every time I am browsing in Firefox, this error comes up. I have done a virus scan using McAfee and found nothing. Is this a Firefox error?

Script: chrome://fctoolbarf5f7ac0099394a6491985d4a5cf5f149/content/fctoolbar.js:5 Every time I am browsing in Firefox, this error comes up. I have done a virus scan using McAfee and found nothing. Is this a Firefox error?

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That is a problem with a toolbar (fctoolbar).

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