[RSS Feed/News] Firefox not showing sub forum in columns

[XenForo]

Howdy,
I have my sub forums in four columns but Firefox is showing them in one long column. Is there a work around for this?

see attached.

I'm using this code.
.node-subNodeFlatList {
display: block;
width: 700px;
columns: 150px 4;

}
.node-subNodeFlatList li {
width: 100%;
float: left;
font-size: 12px;
}

Thank you kindly,

Finn

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