works in Fx2, but not Fx3.0 or Fx3.1. Also works in Safari 4.
Could use a testcase and/or regression dates.
Looks identical to me in Minefield, IE7 and Safari 4 on Windows.
OK, this regressed between 2007-05-23-04 and 2007-05-24-04 on Mac. Bonsai range: http://bonsai.mozilla.org/cvsquery.cgi?treeid=default&module=MozillaTinderboxAll&branch=HEAD&branchtype=match&dir=&file=&filetype=match&who=&whotype=match&sortby=Date&hours=2&date=explicit&mindate=2007-05-23+04&maxdate=2007-05-24+04&cvsroot=%2Fcvsroot Right at the end of that is mac native theming being enabled for HTML. Setting "-moz-appearance:none" on the two text inputs via DOM inspector fixes the layout over here. The relevant style the page has on the input is: "width: 121px". But the page is in standards mode, so text inputs are using content-box sizing, not border-box. And native theming of text inputs on mac adds quite a bit of padding; a lot more than non-themed controls have. So the box width ends up being 121px + border + padding, is too big for the space the page has allotted for it (which is presumably based on 121px + windows native theme padding), and the controls wrap to the next line. I still think that the extra padding the mac native theme produces is a bug, certainly for constrained-width inputs, precisely because of cases like this.
Oh, and naturally setting "-moz-box-sizing: border-box" also fixes the layout.
Clearly this isn't being worked on, and the site doesn't appear to have any problems now. It has probably also changed quite a bit since this was reported.