BrowserStack

This app is only free for 30 minutes, which they don't tell you until you've created an account and given them your full name and email. I couldn't find a way to delete my account with them either, so I just changed all of my info to garbage data and signed out. They built in a checker to filter out email sites designed to receive spam, but do not seem to have created a way to delete your account.

forcing a user to login to a site to switch their user-agent for testing is pure crap -- MS should just build it in instead of having garbage like this -- a bunch avail for Firefox

i do not see any interaction yet