Comment 16 for bug 235200

ok, list of frozen interfaces that would require changes for files >2gb:

nsIChannel.idl:
  attribute long contentLength;

nsIStreamListener:
 67 in unsigned long aOffset,
 68 in unsigned long aCount);
(parameters of onDataAvailable)

nsIFile.idl: surprisingly this requires no changes.

nsIInputStream.idl: several functions + nsWriteSegmentFun
nsIOutputStream.idl: basically same as nsIInputStream

nsIScriptableInputStream:
 49 unsigned long available();
 55 string read(in unsigned long aCount);

-afaik this is a complete list of the frozen interfaces that would require changes-

of the unfrozen ones, nsIWebProgressListener.idl comes to mind, but most likely
there are others.