Examine source code of YuLaF – YouTube Language Filter

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "short_name": "YuLaF",
  "version": "2.3.9",
  "description": "__MSG_extension_description__",
  "default_locale": "en",
  "author": "Vakkas Karakurt & Emrah Fidan",
  "homepage_url": "https://github.com/vakkaskarakurt/YuLaF-YouTube-Language-Filter",
  "minimum_chrome_version": "88",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "https://img.shields.io/chrome-web-store/*"
  ],
  "background": {
    "scripts": [
      "background/main.js"
    ]
  },
  "action": {
    "default_title": "__MSG_extension_name__",
    "default_popup": "pages/popup/index.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content/pre-bootstrap.js"
      ],
      "css": [
        "css/pre-filter.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content/main.js"
      ],
      "css": [
        "css/styles.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src 'self' https://flagcdn.com data:;"
  },
  "incognito": "spanning",
  "offline_enabled": true,
  "commands": {
    "toggle-filter": {
      "suggested_key": {
        "default": "Alt+Y",
        "mac": "MacCtrl+Y"
      },
      "description": "Toggle YouTube Language Filter"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yulaf@yulaf.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}