Examine source code of Twitch: Hide Elements

{
  "manifest_version": 2,
  "name": "Twitch: Hide Elements",
  "icons": {
    "16": "imgs/icon-16.png",
    "32": "imgs/icon-32.png",
    "48": "imgs/icon-48.png",
    "128": "imgs/icon-128.png"
  },
  "browser_action": {
    "default_icon": "imgs/icon-128.png",
    "default_popup": "index.html",
    "default_title": "Twitch: Hide Elements"
  },
  "author": "Baltimora",
  "background": {
    "scripts": [
      "back.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "css": [
        "elements.css"
      ],
      "js": [
        "elements.js"
      ],
      "all_frames": true,
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "*://*.twitch.tv/*"
  ],
  "web_accessible_resources": [
    "carousel_pause.js"
  ],
  "version": "1.4.1",
  "description": "Hide Twitch visual elements like Recommended Channels, Prime Loot, etc.",
  "offline_enabled": true,
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba2ecff9-7809-43ff-9c14-f1ac16838c5a}"
    }
  }
}