Examine source code of Market Extractor

{
  "manifest_version": 2,
  "name": "Market Odds Extractor",
  "version": "1.0.0",
  "description": "Automatically extracts betting market odds and sends to local calculator",
  "browser_specific_settings": {
    "gecko": {
      "id": "market-extractor@yourdomain.com",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "http://localhost:8765/*",
    "*://*.betfair.com/*",
    "*://*.graphs.betfair.com/*",
    "*://*.bet365.com/*",
    "*://ex.indi2.club/*",
    "*://*.indi2.club/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.betfair.com/*",
        "*://*.graphs.betfair.com/*",
        "*://*.bet365.com/*",
        "*://ex.indi2.club/*",
        "*://*.indi2.club/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png",
      "96": "icon.png"
    },
    "default_title": "Market Odds Extractor"
  },
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  }
}