❄️ The BroadcastChannel polyfill for Firefox 29+ and Chrome 5+.
Place snowy.js under the root directory of your site, then run bc.js in your web page to start the polyfill. If you do not want to place snowy.js under the root directory, feel free to set self.SNOWY_PATH to where snowy.js resides.
Polyfill will not be active if BroadcastChannel is already in the browser.