I have a memory from somewhere that one can make URLs in text files 'clickable' when viewing the text file in a browser. I even have a sample file:- http://home.isbd.net/chris/xxx.txt which I'm sure I remember trying once and being surprised when it worked. (I think I maybe had to double click the link)
However I can't make this work now, did I imagine it or can someone point me at what I need - e.g. is it a Firefox extension?