If you're in Responsive Design Mode when opening a PDF, the PDF opens in Responsive Design Mode but you're then unable to leave Responsive Design Mode as the menu item is disabled when viewing a PDF. Reproduction steps: 1. Open a site with a direct PDF link 2. Enter Responsive Design Mode 3. Click the link 4. PDF opens while in Responsive Design Mode Excepted results: Should be able to close Responsive Design Mode when viewing the PDF Actual results: Are unable to exit out of Responsive Design Mode