Examine source code of fenshot: chess board to FEN, one click

{
  "manifest_version": 3,
  "name": "fenshot: chess board to FEN, one click",
  "homepage_url": "https://fenshot.com/",
  "version": "0.4.2",
  "description": "Reads the chess position on any page, and whole games from move lists, then opens them for analysis. Runs entirely on your device.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "index.html",
    "default_title": "Read the chessboard on this page",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fenshot-extension@coachess.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}