Thanks for checking this out.
1. I don't have sufficient code for the username handling, since I can't log in. Could you do me a favor: when logged in, right-click anywhere on the page, choose "Show Page Source", copy that and put it in a text file and email it to me (I sent you my email address in PM). It shouldn't have any confidential information in the page source.
2. This problem relates directly to #1.
3. Ah, so this tab is specific to his add-on? If so, I'll go ahead and remove it.
Thanks again for your help!