Examine source code of Better CB

{
  "manifest_version": 2,
  "name": "Better CB",
  "description": "Improves the display of chat's room",
  "version": "0.0.3.4",
  "permissions": [
    "storage",
    "https://chaturbate.com/",
    "https://www.twitch.tv/",
    "https://www.testbed.cb.dev/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/48.png",
      "96": "icons/96.png",
      "128": "icons/128.png"
    }
  },
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://chaturbate.com/*",
        "https://www.twitch.tv/*",
        "https://www.testbed.cb.dev/*"
      ],
      "css": [
        "css/style.css"
      ],
      "js": [
        "jquery.min.js",
        "pretifier.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yellosmose@gmail.com"
    }
  }
}