Cash offer sites, best used with Internet explorer?

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I did my effort on those cash offer sites such as fusion cash, and cash crate, gptreasure, treasure trooper etc.... Majority of offers I completed didn't work for me, because they weren't credited. Today, gptreasure advised me to use Internet explorer to complete the offers, so it would be easier for them to track the process. So, I did an experiment on it. While I used Firefox, I wasn't get credited. When I use Internet Explorer, after 5 minutes, the same offer I completed was credited instantly. So, would it be wise to use Internet explorer to complete those cash offers instead of other browsers? Can anyone share their opinion and experience with me? So, why it would be difficult to use firefox or other browsers to complete those offers, because of Java script, or other security issue different from browser to browser?