Examine source code of URSA Privacy

{
  "name": "URSA Privacy",
  "short_name": "URSA",
  "description": "High strength symmetric encryption for your favorite email, plus real-time secure chat",
  "version": "4.3",
  "manifest_version": 3,
  "icons": {
    "16": "ursa-icon16.png",
    "48": "ursa-icon48.png",
    "128": "ursa-icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; img-src 'self' data:; connect-src 'self' data:; style-src 'self'"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "ursa-icon16gray.png",
      "48": "ursa-icon48gray.png"
    },
    "default_title": "URSA Privacy"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ursa@passlok.com"
    }
  }
}