Examine source code of Popflash auto accept

{
  "manifest_version": 2,
  "name": "Popflash auto accept",
  "version": "1.1",
  "description": "Automatically ready ups for the pending match when in lobby.",
  "icons": {
    "64": "icons/favicon.png"
  },
  "applications": {
    "gecko": {
      "id": "popflash-auto-accept@l2.com",
      "strict_min_version": "55.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.popflash.site/scrim/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "64": "icons/favicon.png"
    }
  }
}