Examine source code of Destiny Report

{
  "manifest_version": 2,
  "name": "Destiny Report",
  "version": "0.4resigned1",
  "description": "Track players raid stats on Bungie.net fireteams",
  "content_scripts": [
    {
      "matches": [
        "https://www.bungie.net/en/ClanV2/PublicFireteam*"
      ],
      "js": [
        "util.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/DR-48.png",
    "96": "icons/DR-96.png",
    "128": "icons/DR-128.png"
  },
  "permissions": [
    "https://www.bungie.net/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6882742a-25cc-4b96-9139-321dd326eb8c}"
    }
  }
}