Not that this is particularly hidden, but has anyone else found this yet? Cool stuff!
1) You can open a page you’re looking at in one of your alternative browsers (obviously, this screenshot was taken with Safari for Windows)
2) You can also change your User Agent on the fly to see how differently pages render under each User Agent. Nice!
Very helpful for testing/debugging! You can find the setting to turn on the Developer menu in the Preferences, here:
And of course, here’s the link to download Safari for Windows (or Mac):