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Hi !
First:   would you check and see if there are updates for your graphics drivers: http://mzl.la/1xKsEca
Also see:
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues
Good luck and keep us posted !
Hello, if you truly have firefox 19.0, note that you are using a version almost 4 years old, definitely vulnerable, please see : Update Firefox to the latest version.
thank you