does my browser have this enabled or not?
I'm more concerned by the fact that browser vendors are intentionally modifying the behaviour of some browsers and the users won't necessarily know (even though it may be beta software it should be clear and obvious what the user is getting & not some random or unspecified allocation).
Chrome --> "it's only available for an unspecified subset of users"
FireFox --> "SameSite behavior has been activated for 50 per cent of beta users."