Examine source code of Prettier Lichess

{
  "name": "Prettier Lichess",
  "version": "3.13.0",
  "manifest_version": 2,
  "description": "Lichess, but prettier.",
  "icons": {
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://lichess.org/*"
      ],
      "exclude_matches": [
        "*://lichess.org/api*"
      ],
      "run_at": "document_start",
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "*://lichess.org/*"
      ],
      "run_at": "document_idle",
      "js": [
        "postLoad.js"
      ],
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "declarativeContent",
    "downloads",
    "*://lichess.org/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "web_accessible_resources": [
    "styles.css",
    "fonts/*",
    "pieces/*",
    "masks/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8ad4bea8-ad8d-4e98-b434-a76065dee6cb}",
      "strict_min_version": "57.0"
    }
  }
}