You upload the .hlt file.
For me it worked the first time but now I just get the raw json. I have tried killing it but it keeps on showing the raw json. ctrl-r doesn't seem to do anything?
probably the visualizer did not load completely, before you dropped the hlt file
(more patience required, watch the icon in your browser tab settle)
((simply pressing "backspace" should do, what you wanted with ctrl-r))
That did the trick, thanks!
I wrote a quick and cheap server where you specify the file to be viewed in the URL