Description
This is due initially to the code being hard coded to to open http://clay.pebble.com.s3-website-us-west-2.amazonaws.com/ which has been offline for a while.
However I'm not clear the technique being used is possible since late 2017 with a change to Mozilla Firefox, https://blog.mozilla.org/security/2017/11/27/blocking-top-level-navigations-data-urls-firefox-59/ (also see bug https://bugzilla.mozilla.org/show_bug.cgi?id=1331351).
Hacking in a new URL (into https://github.com/pebble/clay/blob/master/dev/emulator.html ) results in an error in the debugger console in Mozilla Firefox:
Navigation to toplevel data: URI not allowed (Blocked loading of: “data:text/html;charset=utf-8,<!DOCTYPE html>...”)
I'm not yet clear why the emulator uses a web page and doesn't use a data URI like it does on the phone.
In the mean time for emulator debugging/testing I'm using a regular web page.