Examine source code of Intruder Notifications

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "homepage_url": "https://intruderfps.com/",
  "description": "__MSG_extensionDescription__",
  "author": "Christopher Satchell",
  "default_locale": "en",
  "permissions": [
    "notifications",
    "https://*.intruderfps.com/",
    "idle",
    "storage"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "__MSG_extensionName__",
    "default_icon": "icons/128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "version": "2.0.2",
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}