Examine source code of Tiktok focus

{
  "manifest_version": 2,
  "name": "Tiktok focus",
  "version": "2.3.0",
  "icons": {
    "16": "assets/icons/favicon-16.png",
    "32": "assets/icons/favicon-32.png",
    "48": "assets/icons/favicon-48.png",
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Focus on watching videos on Tiktok",
  "homepage_url": "https://github.com/bangnokia/tiktokf",
  "short_name": "Tiktok focus",
  "permissions": [
    "http://*.tiktok.com/*",
    "https://*.tiktok.com/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "bangnokia",
  "browser_specific_settings": {
    "gecko": {
      "id": "{223dd7ff-2d54-4cce-b7b3-7057993d0a24}"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/favicon-16.png",
      "32": "assets/icons/favicon-32.png",
      "48": "assets/icons/favicon-48.png",
      "128": "assets/icons/favicon-128.png"
    },
    "default_title": "tiny title",
    "browser_style": false
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.tiktok.com/*",
        "https://*.tiktok.com/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ]
}