[Making this actually follow the followup-to header]

Jeremy Morton wrote:
> And witness the very similar 'Background' text.  I don't see a clear 
> difference documented there.

The clear difference is in what's being cached.  For the HTTP article:

   "This preference controls whether to cache files retrieved by HTTP or HTTPS"

For the memory cache article:

   "This preference controls whether to use memory to cache decoded images,
    chrome (application user interface elements), and secure (https) pages"

For the disk article:

   "This preference controls whether to use the hard drive for caching 
purposes."

The only overlap between HTTP and memory is "secure pages".  The only overlap 
between HTTP and disk is raw data fetched over HTTP.  Both caches store other 
things than raw HTTP data.

-Boris

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