docs: function onAddedExtensions (extensions) {
    console.log('Detected the following additions: ', extensions);
  
    extensions.forEach(function (ext) {
  
      if (this.isExtensionAlreadyProcessed(ext)) return;
  
      this.isExtensionSupported(ext).done(function (isSupported) {
        if (! isSupported) return;
  
        this.processAdditionalExtension(ext);
  
      }.bind(this));
  
    }.bind(this));
  }