Examine source code of Backloggery Extras

{
  "manifest_version": 3,
  "name": "Backloggery Extras",
  "description": "Adds filters to the memory card page.",
  "version": "2.0.0",
  "minimum_chrome_version": "60.0.3112",
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa1fe778-e376-4b78-be02-c58e0512e4b0}"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "action": {
    "default_title": "Letterboxd Extras Settings",
    "default_popup": "options.html",
    "default_icon": {
      "16": "Images/iconaction16.png",
      "32": "Images/iconaction32.png",
      "64": "Images/iconaction64.png",
      "128": "Images/iconaction128.png"
    }
  },
  "icons": {
    "128": "Images/iconlogo128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://backloggery.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://backloggery.com/*",
        "https://www.backloggery.com/*"
      ],
      "js": [
        "polyfill.js",
        "backloggery-extras.user.js",
        "jquery-3.6.0.min.js"
      ],
      "run_at": "document_start"
    }
  ]
}