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manifest.json
{
  "browser_action": {
    "default_icon": {
      "19": "css/icons/19x19.png",
      "38": "css/icons/38x38.png",
      "64": "css/icons/64x64.png"
    },
    "default_popup": "index.html",
    "default_title": "Simple Calculator by SK Zai"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "description": "A simple calculator that remembers your last calculation. You can close it at any time and reopen it without losing your work.",
  "icons": {
    "16": "css/icons/16x16.png",
    "24": "css/icons/24x24.png",
    "32": "css/icons/32x32.png",
    "48": "css/icons/48x48.png",
    "64": "css/icons/64x64.png",
    "96": "css/icons/96x96.png",
    "128": "css/icons/128x128.png"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjrYDrw+bzvMrGqpYl+kgjk4+6pVotMrUkuUxN+fHjUlmIoECK1okOZBcWm3Y6Lny2RjMJtCByJCYWUq8/8X9lKsuS3hMC5yqfeOKXIS4uzxmps8DHAvkIxdKzkqzFmxggYwz0wm1vKECrXluDxALH1JBhCvxJMzEsvaYU/8GSHEG0W6uFZK2B4WY0XFuhAQQYuh7C7OiEK0bsQAjgkiAQbHWDrIF3PMsMXo0G/rxmVVt/H3J6yJUNCkFS+CUi5TG92WfPNhrX7w1utm2+bXT8t3h0tlpwPOI4c7Yorx5HyiJoUNXO6fUjZ2VSgsIAZVj/wUqcFn2FZrIVEUf5e2jFQIDAQAB",
  "manifest_version": 2,
  "name": "Simple Calculator by SK Zai",
  "offline_enabled": true,
  "permissions": [],
  "short_name": "Calculator",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.0"
}