It is NOT about QuickClean although a reference will be made to QuickClean.
This has confused readers on my previous post on this issue, so, I repeat, this is about SHREDDER.
Problem: Selecting 'Temporary Internet Files' in the SHREDDER dialogue will not remove temporary internet files associated with Firefox (and maybe other browsers).
Expected Behaviour: The handling of 'Temporary Internet Files' in SHREDDER should be the same as that in QuickClean. The files should be shredded rather than just deleted and, yes, the process will be anything but Quick.