Grimlin I think it is only available in mullvad browser, not sure. I'll try it. Sincerely, I use most of the time my laptop, where I use different web browsers such as mullvad browser, librewolf, firefox, google, chromium, etc. Anyway you can always install mullvad browser in graphene os but I'm not sure if this is more secure than vanadium. I think the answer is not. However, I think that mullvad browser is more private than vanadium.