Here's what I have on it:
If type is popup, a value of 1 under permission means to allow popups for whatever host is listed for that entry.
If type is cookie, permission will have 1=allow, 2=block, 8=for session only, again for the host listed for that entry.
If type is install, 1=allow the install up updates.
If type is image, 1=allow images, 2=block
JB