Airport1 Duolingo Improvement

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Airport1 Duolingo Improvement",
  "description": "Use space bar (instead of mouse) to activate microphone in Duolingo.",
  "homepage_url": "http://www.airport1.de/",
  "version": "0.1",
  "icons": {
    "32": "img/icon_32.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "img/icon_32.png",
      "48": "img/icon_48.png",
      "128": "img/icon_128.png"
    },
    "default_popup": "src/popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "src/duolingo.js"
      ],
      "matches": [
        "https://www.duolingo.com/*"
      ]
    }
  ]
}