UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:46.0) Gecko/20100101 Firefox/46.0

Example URL:

Steps to reproduce the problem:
1. Visit http://www.w3schools.com/htmL/tryit.asp?filename=tryhtml_input_email
2. Enter: "My Name"@example.com

What is the expected behavior?
That is a valid e-mail

What went wrong?
The input type claims it is not.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A 

Did this work before? N/A 

Does this work in other browsers? No Firefox 46.0.1

Chrome version: 53.0.2780.0 (Official Build) canary (64-bit)  Channel: canary
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

These are all valid e-mail addresse:

"My Name"@example.com
me\@you@example.com
james(nested(comment\)))jo@example.com

But they don't pass Firefox's validation.  I understand that they are uncommon and that some websites may not want to accept them, but the browser shouldn't make those decisions for the website owners.

There is more information here, though even this page doesn't quite cover it all:

http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx/