Examine source code of Letterboxd Text Tools - Format Reviews

{
  "manifest_version": 3,
  "name": "Letterboxd Text Tools - Format Reviews",
  "version": "0.1.0",
  "description": "Adds a bold/italic/quote/link toolbar and a live preview button to Letterboxd review, comment boxes, lists description and bio.",
  "author": "Lilly",
  "browser_specific_settings": {
    "gecko": {
      "id": "letterboxd-texttools@lilly",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icons/icon1.svg"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.svg"
      ],
      "matches": [
        "*://letterboxd.com/*",
        "*://*.letterboxd.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "*://letterboxd.com/*",
        "*://*.letterboxd.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ]
}