user_pref("general.useragent.override.google.com", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0"); (I run linux, but let's make things difficult for malicious sites). Anyhow Google Drive and maps.google.com were happy with the browser. But since the useragent had changed, Google Drive asked me for the recovery email when I logged in to Google Drive. And it also sent a cautionary email to me. Just a heads up, in case people get scared. When ever you change your useragent and log in, Google assumes the login is coming from a different device. Here's a redacted version of the email...
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Date: Tue, 19 Dec 2017 00:00:09 +0000 (UTC)
Subject: Security alert for your linked Google Account
From: Google <firstname.lastname@example.org>
Your account <deleted>@<deleted> is listed as the recovery email for
<deleted>@gmail.com. Don't recognize this account? click here
New sign-in to your linked account
Your Google Account was just signed in to from a new Windows device. You're
getting this email to make sure it was you.
You received this email to let you know about important changes to your
Google Account and services.
© 2017 Google Inc.,1600 Amphitheatre Parkway, Mountain View, CA 94043, USA