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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "drawing calculator",
  "version": "0.0.0.2",
  "description": "uses deep learning to do math problems. WINDOWS ONLY.",
  "permissions": [
    "nativeMessaging"
  ],
  "icons": {
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "manifest_version": 2
}