Examine source code of Geoguessr Plus

{
  "manifest_version": 2,
  "name": "Geoguessr Plus",
  "description": "This extension adds extra accessability functions to geoguessr.",
  "version": "2.3.1",
  "author": "Brennan McDonald",
  "browser_specific_settings": {
    "gecko": {
      "id": "ggp@ebrennan.sh",
      "strict_min_version": "42.0"
    }
  },
  "icons": {
    "48": "img/icon.png"
  },
  "browser_action": {
    "default_title": "Geoguessr+",
    "default_icon": {
      "19": "img/icon.png",
      "20": "img/icon.png",
      "38": "img/icon.png"
    },
    "default_popup": "ui/settings.html"
  },
  "web_accessible_resources": [
    "css/darkmode.css"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.geoguessr.com/*",
        "*://geoguessr.com/*"
      ],
      "js": [
        "darkmode.js",
        "addheader.js"
      ]
    },
    {
      "matches": [
        "*://*.geoguessr.com/battle-royale/*",
        "*://geoguessr.com/battle-royale/*",
        "*://*.geoguessr.com/battle-royale",
        "*://geoguessr.com/battle-royale"
      ],
      "js": [
        "battleroyale.js"
      ],
      "css": [
        "css/tooltip.css"
      ]
    },
    {
      "matches": [
        "*://*.geoguessr.com/me/current",
        "*://geoguessr.com/me/current"
      ],
      "js": [
        "deleteallongoing.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ]
}