Most important thing missing: test site with javascript switched off.
Launching a new website, and focusing on 2% of people seems the wrong priority?
[1] https://gds.blog.gov.uk/2013/10/21/how-many-people-are-missi...
[2] http://stackoverflow.com/questions/9478737/browser-statistic...
Sophisticated underground fraud forum? Yeah, might want to check it. Blog for moms? You should be fine.