Notes:
That property affects only tabs which have value set to their ContentUrl property. That property can be used when web-sites run scripts like jQuiry.js which may attempt to set focus or calculate offsets on initialization regardless of html element visibility. Those can be illegal actions and javascript exceptions can be raised. So, that property allows to load only visible selected ContentUrl and get around bugs in those web sites.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2