Examine source code of News Cleaner

{
  "name": "News Cleaner",
  "version": "1.1",
  "description": "Remove flashy panic inducing gifs esp from Nepali News sites",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "images/icon_48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Newscleaner",
    "default_icon": {
      "16": "images/icon_16.png",
      "24": "images/icon_24.png",
      "32": "images/icon_32.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.onlinekhabar.com/*",
        "*://*.annapurnapost.com/*",
        "*://*.arthasarokar.com/*",
        "*://*.ekantipur.com/*",
        "*://*.ratopati.com/*",
        "*://*.news24nepal.tv/*",
        "*://*.baahrakhari.com/*",
        "*://*.medianp.com/*",
        "*://*.purbelinews.com/*",
        "*://*.nepalipatra.com/*",
        "*://*.nepalitimes.com/*",
        "*://*.setopati.com/*",
        "*://*.ujyaaloonline.com/*",
        "*://*.weeklynepal.com/*",
        "*://*.khabarhub.com/*",
        "*://*.thahakhabar.com/*",
        "*://*.lokpath.com/*",
        "*://*.sutranews.com/*",
        "*://*.dcnepal.com/*",
        "*://*.nepaljapan.com/*",
        "*://*.onlinepana.com/*",
        "*://*.nayapage.com/*",
        "*://*.lokaantar.com/*",
        "*://*.nepallive.com/*",
        "*://*.janaboli.com/*",
        "*://*.reportersnepal.com/*",
        "*://*.sancharkendra.com/*",
        "*://*.dainikonline.com/*"
      ],
      "css": [
        "newscleaner.css"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "manifest_version": 2
}