Firefox getting built-in HTML5-based PDF viewer to improve security

A built-in PDF viewer component based on JavaScript and HTML5 Web technologies has been added to the beta version of Firefox 19, Mozilla said Friday. The browser maker described the built-in PDF viewer as more secure and safer than proprietary PDF viewing plug-ins, like those installed by Adobe Reader or Foxit Reader. However, several security experts noted that it probably won't be free of vulnerabilities.