Start with `yo polymer`.
Remove sample files.

.htaccess?
Copy sources over.
Format gruntfile.
Have nothing to uglify, so remove. (no root level js)
Enable CSP for vulcanize.
Add firefox-manifest grunt task.
Add firefox-package task.

Task seems to be working, but there's still something wrong with
web-components/ff when running as a packaged app; just get a white
screen and document fails to parse.