Examine source code of Better Wiktionary

{
  "manifest_version": 2,
  "name": "Better Wiktionary",
  "description": "Makes it more convenient to use Wiktionary.",
  "version": "1.8",
  "author": "Sin Jeong-hun",
  "icons": {
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "https://*.wiktionary.org/wiki/*",
    "contextMenus",
    "storage"
  ],
  "web_accessible_resources": [
    "flags/*.svg",
    "data/*.txt"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.wiktionary.org/wiki/*"
      ],
      "js": [
        "settings_common.js",
        "sjhUtilities.js",
        "modifier.js"
      ],
      "css": [
        "my.css"
      ]
    }
  ],
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ca98e91-d41b-4661-be14-fa86c2d58a2a}"
    }
  }
}