I have been looking to use Prism. A gotcha I hit was it balked at any site using a self-signed SSL certificate. A recommendation was to copy the cert8.db file from a Firefox profile to a Prism profile. This actually worked.
Locating it is a bit of a pain in the ass on Windows. It is in what would be a hidden folder, so some layers have to be opened up just to get to it. Copy from
<user>/Application Data/Mozilla/profiles/default to
Excellent. Now it is a fair evaluation.