That is because Web Browser does not exist. It might have existed years ago and has been discontinued. It was replaced with https://synthiam.com/Support/Skills/User-Interface/Chromium?id=20391

Remove that robot skill to avoid confusion: https://synthiam.com/Support/ARC-Overview/robot-skills/Uninstall%20Robot%20Skill

Ok, I deleted it,

Using Chromium now - thanks