Examine source code of Learn Language w/ Jellyfin

{
  "manifest_version": 3,
  "name": "Learn Language w/ Jellyfin",
  "version": "1.2.1",
  "description": "Show two subtitle tracks simultaneously on Jellyfin with selectable text for Yomitan/Migaku.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@jellyfin-dual-subs",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "src/content.bundle.js"
      ],
      "css": [
        "src/overlay.css",
        "src/panel.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}