Examine source code of Learn Finnish - Dual Subtitles for Finnish Streaming

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Learn Finnish - Dual Subtitles for Finnish Streaming",
  "version": "3.2.5",
  "description": "Learn Finnish with dual language subtitles on YLE Areena & Ruutu. Support translation to English, Vietnamese, German and others.",
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "background": {
    "service_worker": "main/background/background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://areena.yle.fi/*"
      ],
      "run_at": "document_end",
      "js": [
        "main/utils/database.js",
        "main/utils/utils.js",
        "main/platform/yle/contentscript.js",
        "main/background/inject.js"
      ],
      "css": [
        "main/platform/yle/styles.css"
      ]
    },
    {
      "matches": [
        "https://www.ruutu.fi/*"
      ],
      "run_at": "document_end",
      "js": [
        "main/utils/database.js",
        "main/utils/utils.js",
        "main/platform/ruutu/contentscript_ruutu.js",
        "main/background/inject.js"
      ],
      "css": [
        "main/platform/ruutu/styles_ruutu.css"
      ]
    }
  ],
  "host_permissions": [
    "https://api-free.deepl.com/*",
    "https://api.deepl.com/*"
  ],
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "main/background/injected.js"
      ],
      "matches": [
        "https://areena.yle.fi/*",
        "https://www.ruutu.fi/*"
      ]
    }
  ],
  "action": {
    "default_title": "Learn Finnish - Dual Subtitles for Finnish Streaming",
    "default_popup": "extension-popup/popup.html",
    "default_icon": {
      "16": "icons/icon.png",
      "48": "icons/icon.png",
      "128": "icons/icon.png"
    }
  },
  "options_page": "extension-options-page/dist/index.html"
}