Completely unable to find out elsewhere. Huge thanks any help.
The thing is someone told me they could just open a .tar.gz file and
read it directly with firefox - as, say, lynx reads .gz files. The main
thing is to be able to read gziped html files without the trouble of
manually ungzipping them first.
Sorry to bugger you about.:-)
It was a good question. If no-one asks, no-one learns.
One need not be a geek to use Linux, just willing to try something new.