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manifest.json
{
  "manifest_version": 2,
  "name": "Codeforces Random Problem",
  "version": "1.0",
  "description": "Get a random Codeforces problem of a specific rating.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa286a91-1f03-4dab-8535-4c89b3732247}"
    }
  }
}