Disabling the vBMenu System 
Should you wish to disable the vBMenu system completely, displaying non-popup content to all visitors regardless of their web browser's capabilities, you can do this by going to vBulletin Options > Style & Language Options and setting the Use 'vBMenu' DHTML Menus? setting to No.

After clicking the [Save] button, the $show['popups'] will be set to false for all visitors, and anyone visiting the site will be shown the alternative, no-popups layout.
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