simple tank game

The player controls the tank to fight, destroys the enemy to score, is destroyed or collided to reduce the points

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manifest.json

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_name__",
  "short_name": "__MSG_short_name__",
  "version": "0.1.2",
  "description": "__MSG_description__",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "tabs",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "background": {
    "page": "background/background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "play",
    "default_popup": "index2.html"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}