Where does it break down -- clicking the control doesn't display the list, clicking the specific country doesn't actually select the country, etc. It might be helpful to link to a specific page and describe which item has the problem. Could you test the form in Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: [[Troubleshoot Firefox issues using Safe Mode]]. You can restart Firefox in Safe Mode using Help > Restart with Add-ons Disabled In the dialog, click "Start in Safe Mode" (''not'' Reset) Any difference?