<html> <head> <style> #myStyle:-moz-display-comboboxcontrol-frame { -moz-user-input: none !important; } #myStyle:-moz-dropdown-list { -moz-user-input: none !important; } </style> </head> <body onload="getElementById('mySelect').setAttribute('id', 'myStyle');"><select id="mySelect"></select></body></html>