Examine source code of gpsio-extension

{
  "manifest_version": 2,
  "name": "gpsio",
  "description": "GPS IO",
  "version": "1.1.0",
  "browser_action": {
    "default_icon": "gpsio_icon_16.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5da30c55-01fd-4045-a0d2-41c47ebc8b83}"
    }
  },
  "icons": {
    "16": "gpsio_icon_16.png",
    "48": "gpsio_icon_48.png",
    "128": "gpsio_icon_128.png"
  },
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ]
}