Dual Subtitles for TED Talks

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Dual Subtitles for TED Talks",
  "description": "This extension displays two subtitles at once - a translated subtitle alongside the original transcript.",
  "version": "1.3.1",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "16": "icon16x16.png",
    "32": "icon32x32.png",
    "48": "icon48x48.png",
    "128": "icon128x128.png"
  },
  "content_scripts": [
    {
      "js": [
        "contents.js"
      ],
      "css": [
        "interface.css"
      ],
      "matches": [
        "https://www.ted.com/talks/*"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "webRequest"
  ],
  "host_permissions": [
    "https://www.ted.com/talks/*",
    "https://pubads.g.doubleclick.net/*"
  ]
}