Many recent browser versions include their own, native PDF plug-ins that automatically replace the Acrobat and Reader plug-in from Adobe. Installing Firefox 19 or later or Chrome 8.0.552.215 and later can result in your Adobe plug-in being silently disabled and replaced. Browser plug-ins typically do not support all PDF capabilities or offer comparable features. It's sometimes necessary to revert to the Adobe plug-in if you experience the following problems:
- 3D models don't render
- Embedded SWF files don't play
- Parts of a PDF don’t display
- Poor performance or image quality
- Large files sizes when printing to PDF

