JFR is a Command in Minecraft.
{ "id": "jfr", "type": "Command", "data": { "name": "JFR", "Command-EDITION": { "jfr__Command-EDITION__java-edition": true }, "Version-ADDED_CONTENT-Command": { "java-21-w-37-a__Version-ADDED_CONTENT__jfr": true } }, "updatedAt": 1649681078989 }