The Search Engines Helper extension is made and maintained by Soufiane Sakhi for the Firefox browser.
When using the Add a new search engine feature, submitted search engine data are sent to the http-request-echo-server open source service, which doesn't store any user information; the source code of this service can be found in the following repository.
Otherwise, no data, including personally identifiable information, is collected by this browser extension.
If you have any questions feel free to email [email protected].