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Update your Flash Player Version 18.0.0.160
https://www.adobe.com/products/flashplayer/distribution3.html
See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
There also is an update available for the Adobe Acrobat plugin. I suggest using the Help menu in your Adobe product (Adobe Reader or Adobe Acrobat) to "Check for Updates" as the safest and easiest way to catch up to version 11.0.11.