Chronos Development

How are the steps to develop Chronos? There is no README.

I tried to build the core source but some warnings raised, should I ignore it?

└─[$] ./build.sh                                                                                                    [16:24:34]
	zip warning: name not matched: bower_components/bootstrap/LICENSE
	zip warning: name not matched: bower_components/bootstrap/dist/js/bootstrap.js
	zip warning: name not matched: bower_components/bootstrap/dist/css/bootstrap.css
	zip warning: name not matched: bower_components/bootstrap/dist/fonts/
	zip warning: name not matched: bower_components/bootstrap-select/dist/css/bootstrap-select.css
	zip warning: name not matched: bower_components/bootstrap-select/dist/js/bootstrap-select.js
	zip warning: name not matched: bower_components/jquery/LICENSE.txt
	zip warning: name not matched: bower_components/jquery/dist/jquery.js
	zip warning: name not matched: bower_components/mousetrap/LICENSE
	zip warning: name not matched: bower_components/mousetrap/mousetrap.js
  adding: manifest.json (deflated 67%)
  adding: manifest.webapp (deflated 67%)
  adding: chronos.html (deflated 80%)
  adding: key.html (deflated 53%)
  adding: settings.html (deflated 74%)
  adding: chronos.css (deflated 59%)
  adding: backend.js (deflated 81%)
  adding: background.js (deflated 47%)
  adding: chronos.js (deflated 75%)
  adding: key.js (deflated 29%)
  adding: settings.js (deflated 71%)
  adding: icons/chronos-light.svg (deflated 35%)
  adding: icons/chronos.svg (deflated 35%)
  adding: icons/chronos-128.png (stored 0%)
  adding: icons/chronos-16.png (deflated 5%)
  adding: icons/chronos-48.png (deflated 0%)
  adding: icons/chronos-light-128.png (deflated 0%)
  adding: icons/chronos-light-16.png (deflated 5%)
  adding: icons/chronos-light-48.png (deflated 0%)
  adding: LICENSE (deflated 47%)

I tried to install the resulting zip through Extensions upload file, but with no success, a Firefox warning show up about damaged/corrupted extension.
I managed to install the zip through Temporary Extension Install, but seams not to be any JS or CSS.

You must install the bower dependencies.
With that you should be able to load temporary the add-on.