Examine source code of Document Sending

{
  "name": "Document Sending",
  "short_name": "Doc Send",
  "version": "1.4.3",
  "default_locale": "en",
  "manifest_version": 2,
  "description": "This extension verifies content on 3rd party web applications",
  "homepage_url": "https://bossinsights.com",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.gusto-demo.com/*",
        "https://*.gusto.com/*",
        "https://hr.my/*",
        "https://*.adp.com/*",
        "https://*.squareup.com/*",
        "https://*.patriotsoftware.com/*",
        "https://*.traxpayroll.com/*",
        "https://*.waveapps.com/*",
        "https://*.flexitime.app/*",
        "https://*.paychex.com/*",
        "https://*.qbo.intuit.com/*",
        "https://*.netlinksolution.com/*",
        "https://*.paycor.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "js/tab-telemetry.js"
      ]
    },
    {
      "matches": [
        "https://*.myintranet.app/dock/browser-file*",
        "https://*.myintranetapps.ca/dock/browser-file*",
        "https://*.myintranetapps.com/dock/browser-file*",
        "https://*.bossinsights.uk/dock/browser-file*",
        "https://*.bossintegration.com/dock/browser-file*",
        "https://*.aboutus123.com/dock/browser-file*"
      ],
      "js": [
        "js/has-extension-installed.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "page": "src/bg/background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Document Sending",
    "default_popup": "src/browser_action/browser_action.html"
  },
  "permissions": [
    "cookies",
    "storage",
    "pageCapture",
    "activeTab",
    "webRequest",
    "https://*.myintranetapps.com/*",
    "https://*.myintranetapps.ca/*",
    "https://*.bossinsights.uk/*",
    "https://*.myintranet.app/*",
    "https://*.bossintegration.com/*",
    "https://*.bossinsights.com/*",
    "https://*.aboutus123.com/*",
    "https://*.gusto-demo.com/*",
    "https://s3.amazonaws.com/*.zenpayroll-demo.com/*",
    "https://s3.amazonaws.com/*.zenpayroll.com/*",
    "https://*.gusto.com/*",
    "https://hr.my/*",
    "https://*.adp.com/*",
    "https://*.squareup.com/*",
    "https://*.patriotsoftware.com/*",
    "https://*.traxpayroll.com/*",
    "https://*.waveapps.com/*",
    "https://*.flexitime.app/*",
    "https://*.paychex.com/*",
    "https://*.qbo.intuit.com/*",
    "https://*.netlinksolution.com/*",
    "https://*.paycor.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f66bea1-3e2b-4a71-969a-ffb12a03a3f0}"
    }
  }
}