That new tab screen and the error message are not part of Firefox. They are from some extension you have installed. Try disabling them until it goes away and then report the issue to the author of the extension at fault.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → INVALID
DTFOX is afaik from an AVG toolbar/addon
I am having the same problem and i only have foxytunes add on and the download bar.. thats it. nothing else. It's not with AVG cause i don't use AVG
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