Examine source code of ESPC Floor Area

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "ESPC Floor Area",
  "description": "Displays the floor area of properties on ESPC.com when viewing search results.",
  "content_scripts": [
    {
      "matches": [
        "*://espc.com/*"
      ],
      "js": [
        "main.js"
      ],
      "css": [
        "spinner.css"
      ]
    }
  ],
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b704c699-0ded-4cd8-b3c9-3e2470da4284}",
      "strict_min_version": "109.0"
    }
  }
}