Examine source code of What's New, Reddit

{
  "manifest_version": 2,
  "name": "What's New, Reddit",
  "short_name": "WNR",
  "version": "1.0.16resigned1",
  "author": "Mr Speaker",
  "description": "Auto-refresh and visual highlight of changes on reddit post pages",
  "homepage_url": "https://github.com/mrspeaker/whats-new-reddit",
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/r/*",
        "https://www.reddit.com/"
      ],
      "js": [
        "Settings.js",
        "whats-new-reddit.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "wnr-48.png",
    "96": "wnr-96.png"
  },
  "applications": {
    "gecko": {
      "id": "{47995de1-53cb-44e2-b774-6fd431876836}"
    }
  }
}