Examine source code of Reddit Block

{
  "manifest_version": 2,
  "name": "Reddit Block",
  "version": "1.3",
  "description": "Blocks reddit and redirects to a random article from hackernews, a random article from an RSS feed and/or a site picked from a list of sites.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "reddit_block.js"
      ]
    }
  ],
  "permissions": [
    "https://hacker-news.firebaseio.com/v0/*",
    "*://*/*",
    "webRequest",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "options.html",
    "default_icon": {
      "16": "icons/border-16.png",
      "32": "icons/border-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{933266a5-7735-4235-aab8-522fc7ca4a06}"
    }
  }
}