Examine source code of Danbooru Enhancer

{
  "manifest_version": 2,
  "name": "Danbooru Enhancer",
  "description": "Various tweaks to assist Danbooru users/contributors.",
  "version": "0.1.0",
  "permissions": [
    "contextMenus",
    "notifications",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.donmai.us/*"
      ],
      "js": [
        "danbooru.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9e3b8949-1edc-40f5-a56a-26c38e23838f}"
    }
  }
}