GX is a version of the Opera browser specificially designed with gaming in mind. It has been available as an early-access build since June 2019, and has proved so popular that it has accrued over 1 million downloads to date. Opera GX offers Twitch support, a section for new releases and a network limiter.
https://www.notebookcheck.net/The-Opera-GX-browser-attracts-over-1-million-downloads.434800.0.html