Examine source code of Atcoder Task Extension

{
  "name": "Atcoder Task Extension",
  "version": "1.0",
  "icon": {
    "128": "icons/logo_128.png"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://atcoder.jp/contests/*/tasks"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/logo.png",
    "default_title": "Atcoder Task extension"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d671bc9-83d9-45b8-a2cd-8bdee1f1ff8a}"
    }
  }
}