nsICacheVisitor in Firefox 3.6a1pre

 Called to provide information about a cache device.

 @param deviceID - specifies the device being visited.
 @param deviceInfo - specifies information about this device.

 @return true to start visiting all entries for this device.
 @return false to advance to the next device.

 Called to provide information about a cache entry.

 @param deviceID - specifies the device being visited.
 @param entryInfo - specifies information about this entry.
 
 @return true to visit the next entry on the current device, or if the
   end of the device has been reached, advance to the next device.
 @return false to advance to the next device.