Now.gg is an official partner of many game studios. It runs Roblox in a browser via a virtual Android phone.
If you want a safer or more reliable way to play, consider these alternatives: robloxunblockedgithubio
Some GitHub pages embed Roblox inside a third-party cloud service like Now.gg (a browser-based Android emulator). You play Roblox entirely in a browser tab without installing anything. robloxunblockedgithubio