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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "PICAXE programmer",
  "version": "1.0.3",
  "manifest_version": 2,
  "description": "Download PICAXE .axe file to a device",
  "minimum_chrome_version": "45",
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  },
  "icons": {
    "16": "res/audio_16.png",
    "24": "res/audio_24.png",
    "32": "res/audio_32.png",
    "48": "res/audio_48.png",
    "128": "res/audio_128.png",
    "256": "res/audio_256.png"
  },
  "permissions": [
    "webview",
    "app.window.alwaysOnTop",
    "serial",
    "storage"
  ]
}