A Sudoku game

Players need to infer the numbers of all the remaining spaces according to the known numbers on the 9 × 9 disk

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manifest.json

{
  "browser_action": {
    "default_icon": "icons/icon-white128.png",
    "default_popup": "popup.html",
    "default_title": "__MSG_appButtonDesc__"
  },
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icons/icon-white16.png",
    "48": "icons/icon-white48.png",
    "128": "icons/icon-white128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "permissions": [
    "tabs",
    "http://*/",
    "https://*/",
    "cookies",
    "webRequest",
    "webRequestBlocking"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "background": {
    "page": "background/background.html",
    "persistent": true
  },
  "version": "1.0.0.1",
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}