Examine source code of cout970-password-manager

{
  "manifest_version": 3,
  "name": "cout970-password-manager",
  "description": "A browser extension that derives your passwords instead of storing them.",
  "version": "3.0.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png",
    "192": "icon/192.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab",
    "clipboardWrite"
  ],
  "optional_host_permissions": [
    "https://ps.cout970.net/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "password_manager@cout970.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Password Manager",
    "default_popup": "popup.html"
  }
}