manifest.json

{
  "name": "APK Downloader",
  "description": "Download APK from Google Play Store (Android Market).",
  "version": "2.1",
  "manifest_version": 2,
  "homepage_url": "https://lekensteyn.nl/apk-downloader/",
  "update_url": "https://lekensteyn.nl/apk-downloader/updates.xml",
  "icons": {
      "16": "icon_16.png",
      "48": "icon_48.png",
      "128": "icon_128.png"
  },
  "page_action": {
    "default_icon": "page_action.png",
    "default_title": "APK Downloader"
  },
  "content_scripts": [{
      "matches": [
          "*://play.google.com/*"
      ],
      "run_at": "document_end",
      "js": ["market.js"]
  }],

  "options_page": "options.html",
  "background": {
      "scripts": ["jsxcompressor.min.js", "protocol.js", "progress.js", "background.js" ],
      "persistent": false
  },
  "permissions": [
    "cookies",
    "downloads",
    "webNavigation",
    "https://www.google.com/accounts/ClientLogin",
    "*://*.android.clients.google.com/*"
  ]
}