Examine source code of Awoobooru

{
  "manifest_version": 2,
  "name": "Awoobooru",
  "version": "2.0.1",
  "icons": {
    "32": "icon32.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "description": "Extra Danbooru functions",
  "applications": {
    "gecko": {
      "id": "nuanlim29@gmail.com"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icon32.png",
      "64": "icon64.png",
      "128": "icon128.png"
    },
    "default_title": "Awoobooru",
    "default_popup": "html/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.donmai.us/*"
      ],
      "js": [
        "scripts/bootstrap.bundle.min.js",
        "scripts/content.js"
      ],
      "css": [
        "css/bootstrap.min.css",
        "css/global.css",
        "themes/dark.css"
      ],
      "run_at": "document_end"
    }
  ]
}