7f5ad477_ebug_Preferences___FirebugWiki__UI_Equivalents
[Option] net.hiddenColumns [Description] Hidden columns inside the Net Panel [Valid Values] netHrefCol, netTimeCol, netSizeCol, netDomainCol, netStatusCol [Default] "" [UI Equivalents] 
Net Panel->Request List header context menu->Columns
Firebug Preferences - FirebugWiki