Hi Phillipe Damerval,
I have tested the jqxDropDownList with the latest version of jQwidgets with several browser including Firefox and I did not found any problems.
If you want to have the DropDownList to be centered using the fiddle you shared you can just remove dropDownHorizontalAlignment
and dropDownWidth
properties and it will automatically be set to the width of the widget and it will be centered.
A quick code snippet:
$("#jqxDropDownList").jqxDropDownList({
source: source,
theme: 'energyblue'
});
Please, do not hesitate to contact us if you have any additional questions.
Best Regards,
Yavor Dashev
jQWidgets team
https://www.jqwidgets.com