Examine source code of DownAllPics&Vids

{
  "manifest_version": 2,
  "name": "DownAllPics&Vids",
  "short_name": "DAP&V",
  "version": "1.1resigned1",
  "author": "Paul Bournat",
  "description": "Open pictures and videos in tabs and download them all at once",
  "icons": {
    "128": "icons/button-128.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "icons/button-128.png"
    },
    "default_title": "DownAllPics&Vids"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "downloads",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc06a9e5-babb-4856-9425-1f5622c6835b}"
    }
  }
}