Examine source code of Clipboard Sync

{
  "manifest_version": 2,
  "name": "Clipboard Sync",
  "version": "1.1",
  "description": "Allows the user to send text or images to a different device via QR Code.",
  "icons": {
    "48": "icons/clipboard-48.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/clipboard-32.png"
    },
    "default_title": "Clipboard Sync",
    "default_popup": "popup/clipboard-sync.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clipboard@gigashell.com"
    }
  }
}