Hi @2foreignvets, Facebook is A-B testing this feature: they provide it to users with some browsers and not to other browsers.
If successful, they eventually will push it out to all users. If not, it'll be removed for all users.
There are ways to hide which browser you're using, by using a custom user agent. Various extensions can do this (see addons.opera.com), so if you really want this and you know Facebook is enabling it for (for example) Chrome on Mac then you can make this happen 🙂