1. The username field assumes you are entering a social security number and masks all but the last four ‘digits’ of your input, given a sufficiently long username.
2. The tab ordering changed so I had to tab more than four times to get from the username to password field (I gave up after four tabs).

Once you log into the site, there is no option to submit feedback that I could find. When you log out, there is a contact link, but website feedback is hidden under a link: Participant in a 401(k) Plan Managed by Fidelity. This link is right above General Investing Inquiry, so it wasn’t particularly obvious it was what I wanted.

After I wrote my message, a dialog box popped up saying I had entered invalid characters.

Of course, after review of the message, none of these characters were present in the message. I tried removing parentheses with no luck. Then I figured it was the slash (/) character. Still, no luck. So I started removing newlines. Eventually I just kept removing bits of the message until it got sent.

Turns out it was in fact the slash character, though removing it the first time didn’t work. All told, I have now submitted six comments to Fidelity, including a rant on the form through which I couldn’t manage to submit my comments.