Examine source code of RandomCredentials

{
  "manifest_version": 2,
  "name": "RandomCredentials",
  "author": "RevisionWorksLLC.",
  "version": "1.1.2",
  "description": "Generate and manage random passwords easily",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'none';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5e24ef6-a0cd-459d-a2ec-0b0d40b2db29}",
      "strict_min_version": "57.0"
    }
  }
}