Examine source code of Gif Maker

{
  "manifest_version": 2,
  "name": "Gif Maker",
  "version": "1.0",
  "description": "A simple GIF maker tool as a Firefox extension.",
  "icons": {
    "48": "favicon.ico"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "favicon.ico"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4649caf3-da44-42fe-a623-b32c9cd6077d}"
    }
  }
}