Duolingo immersion unlocker

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Duolingo immersion unlocker",
  "short_name": "Duo unlock",
  "description": "Gives opportunity for many users to translate articles in Duolingo.",
  "version": "1.1",
  "permissions": [
    "https://www.duolingo.com/*"
  ],
  "browser_action": {
    "default_icon": "icons/duo16.png"
  },
  "icons": {
    "16": "icons/duo16.png",
    "48": "icons/duo48.png",
    "128": "icons/duo128.png"
  },
  "manifest_version": 2,
  "web_accessible_resources": [
    "/unlocker.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.duolingo.com/*"
      ],
      "js": [
        "injector.js"
      ],
      "run_at": "document_start"
    }
  ]
}