Examine source code of Simple Image Resizer

{
  "name": "Image Resizer",
  "version": "2.0",
  "manifest_version": 2,
  "description": "Resizes images from your device",
  "key": "4841d3e824da41d88213684508ca8fb4",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon128.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ad9c72b-bede-47ba-90ba-7bf46b2ed5d6}"
    }
  }
}