I checked the source code. There is none. This addon only adds a search engine entry

Starts to block questions from TOR or open proxies, just like google. No longer useable for me and i no longer trust them. Now owned by a advertisment agency.

Do not trust Startpage anymore, it was sold to an advertising company called System1
Link: https://www.datingnews.com/industry-trends/startpage-new-tools-allow-daters-to-browse-anonymously/

Simply adds the search engine, without the other bloat the official extension has.