A column in a listbox. You can make some columns flexible and other columns non-flexible.
Examples
Example
<!-- A two column listbox with one column flexible -->
<listbox>
  <listhead>
    <listheader label="First"/>
    <listheader label="Last"/>
  </listhead>
  <listcols>
    <listcol flex="1"/>
    <listcol/>
  </listcols>
  <listitem>
    <listcell label="Buck"/>
    <listcell label="Rogers"/>
  </listitem>
  <listitem>
    <listcell label="John"/>
    <listcell label="Painter"/>
  </listitem>
</listbox>
Attributes
| Inherited from XUL element | 
Properties
| Inherited Properties |