Examine source code of Bootstrap notification

{
  "manifest_version": 2,
  "name": "Bootstrap notification listener",
  "version": "0.16",
  "description": "This extension will listen to any bootstrap notification and raise an alert to the user.",
  "icons": {
    "48": "cloud.svg",
    "96": "cloud.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "notifications",
    "clipboardWrite"
  ]
}