Baroness.com works fine —except in Firefox. There's always been an extra 28px margin at the top. Doing a global search, the only place I could find "28px" was in admin-bar.php. It appeared to be in a section that was commented out, but I deleted them to see what would happen. Now (in Firefox only), there's a huge message at the top of the page:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '_admin_bar_bump_cb' was given in /home/baroness/baroness.com/wp-includes/plugin.php on line 405
I have no idea what this means or how to fix it. Restoring a previous version of admin-bar.php (before I edited it), didn't work! I don't see how this is possible, and would hugely appreciate any help.