I'm using Firefox 18 under Windows XP SP3 to open a page I built using jQuery and jQuery UI to generate a form with 'select boxes'. The select boxes are not being opened. The log has no error messages, only CSS warnings (-moz-border-radius, background properties and so on).
I tried starting Firefox in Safe Mode with a new profile, as suggested here but this did not solve the problem.
How can I debug this problem?