Examine source code of Sentry Cookie Sync

{
  "manifest_version": 2,
  "name": "Sentry Cookie Sync",
  "version": "1.6.1",
  "icons": {
    "32": "assets/icons/favicon-32.png",
    "128": "assets/icons/favicon-128.png",
    "180": "assets/icons/favicon-180.png",
    "192": "assets/icons/favicon-192.png"
  },
  "description": "Sync cookies for local frontend development of sentry.io",
  "homepage_url": "https://github.com/getsentry/cookie-sync",
  "short_name": "Cookie Sync",
  "permissions": [
    "cookies",
    "storage",
    "tabs",
    "https://*.sentry.io/*",
    "https://*.sentry.dev/*",
    "https://*.dev.getsentry.net/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "Ryan Albrecht",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7fe2556-f3c9-4167-a98e-671faacf82cf}"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Sentry Cookie Sync",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "js/serviceworker.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.sentry.dev/auth/login/",
        "https://dev.getsentry.net:7999/auth/login/",
        "https://*.dev.getsentry.net:7999/auth/login/",
        "https://new.staging.getsentry.net/auth/login"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ]
}