Unfortunately, I don't know of any way to determine if a third-party script is interfering with FEBE. If it was a regular add-on, I do have an extension that can find conflicts (it's called FECT
), but I don't think it would be of help in this situation.
It would seem that the script is not directly affecting the operation of FEBE, but rather Firefox itself when "phoning home" to AMO to determine FEBE's compatibility. I'm curious, is FEBE the only extensions that is getting flagged as incompatible?