Examine source code of timee

{
  "manifest_version": 2,
  "name": "timee",
  "description": "Convert date and time to your time zone with timee.io",
  "version": "1.0.2resigned1",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon48.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aaae5e23-9122-4366-82ca-52e1f664c97b}"
    }
  }
}