No. They will just use the $10 card and leave. They will prey on the fact that “get a gift card for your computer troubles” is something a legitimate company has done.

Buy a $10 Xbox gift card and send us the code so that we can activate it. Then you get back to the shop and get $20 in cash - $10 for returning the card and $10 from us. We’ll pay the tax, too.

If you don’t want to use the potentially unstable Nightly, Dev or Beta, you can use Fennec (stable builds with dev features).