Examine source code of Better Twitch Adblock

{
  "description": "Blocks Video Ads on Twitch.tv.",
  "manifest_version": 2,
  "name": "Better Twitch Adblock",
  "version": "3.0.3",
  "icons": {
    "48": "icons/adblock-48x48.png",
    "96": "icons/adblock-96x96.png"
  },
  "browser_action": {
    "default_icon": "icons/adblock-32x32.png",
    "default_title": "Better Twitch Adblock",
    "default_popup": "popup/index.html"
  },
  "options_ui": {
    "page": "popup/index.html",
    "browser_style": false,
    "chrome_style": false
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "https://*.twitch.tv/*",
    "https://*.amazon-adsystem.com/*",
    "https://cdn.krxd.net/*",
    "https://script.ioam.de/iam.js",
    "https://edge.quantserve.com/quant.js",
    "https://ddacn6pr5v0tl.cloudfront.net/custom-moat-video-native.min.js",
    "https://d2v02itv0y9u9t.cloudfront.net/dist/1.0.5/v6s.js",
    "https://*.imrworldwide.com/*",
    "https://countess.twitch.tv/*",
    "https://*.scorecardresearch.com/*",
    "https://www.googletagservices.com/tag/js/gpt.js",
    "*://*.branch.io/*",
    "*://comscore.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "donnyjones010110@gmail.com",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.twitch.tv/*"
      ],
      "run_at": "document_start",
      "js": [
        "content.js"
      ]
    }
  ]
}