Examine source code of Netboxd

{
  "manifest_version": 2,
  "name": "Netboxd",
  "version": "0.0.1",
  "author": "arunpdl",
  "description": "A simple browser extension to directly display Netflix link in letterboxd movie page",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png",
    "512": "icons/icon512.png"
  },
  "browser_action": {},
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "https://letterboxd.com/*/",
    "https://*.letterboxd.com/film/*",
    "https://*.letterboxd.com/*/film/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.letterboxd.com/film/*",
        "https://*.letterboxd.com/*/film/*",
        "https://letterboxd.com/film/*"
      ],
      "css": [
        "css/content.css"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "css/content.css",
    "css/netflix.png",
    "css/watch.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "arunpdl013@gmail.com",
      "strict_min_version": "53.0"
    }
  }
}