Examine source code of Dong Dmc

{
  "name": "Dong Dmc",
  "version": "1.0",
  "description": "Show all images",
  "manifest_version": 2,
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.dongdmc.com/*"
      ],
      "js": [
        "js/jquery.js",
        "js/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png"
    },
    "default_title": "Show all images",
    "default_popup": "popup.html"
  }
}