@leocg While his photo shows adding a search engine, I think he just grabbed that from the web. His other post was one of those "question in the title" posts that I didn't approve as I saw this first, but was more explicit that he wanted to add GX to a Chromebook.
@Beaglez Regular Opera does include a VPN and thus might unblock sites, provided the school didn't block the VPN. But for example the place where I work does block the VPN, so I can't promise it'll work for you.