palemoon-dev/platform/layout/xul/tree/crashtests/391178-2.xul

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  <box style=" display: -moz-box; position: fixed;">
    <treecol style=" display: -moz-box;"/>
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  <box style="position: fixed;">
    <treechildren style="display: -moz-box; position: absolute;"/>
  </box>
</tree>

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