Russian language lessons

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Russian language lessons",
  "version": "1.3",
  "manifest_version": 2,
  "description": "Russian language lessons - online course to learn Russian for free",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  }
}