Examine source code of OpenOTP

{
  "manifest_version": 2,
  "name": "OTP Authenticator",
  "version": "1.0.0",
  "description": "Generate OTP codes for two-factor authentication",
  "author": "Alfred Roos",
  "homepage_url": "https://github.com/spynetS/OpenOTP",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d870d554-6689-4298-bb9c-9c015535b635}"
    }
  }
}