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I use Firefox 16.0.2 and Flash 11.5 502 keeps crashing, what can I do tosolve the problem?


I use Firefox 16.0.2 and Flash 11.5 502 plugin keeps crashing. I switch to Chrome or IE and don't have any problems. If I uninstall Flash plugin then Firefox works fine - any suggestions as to what I can do? This has been happening for approximately two weeks and I keep awaiting for an update of Firefox assuming you know of the problem. I run AVG Free anti-malware , Zone Alarm firewall and Trusteer Rapport.

Chosen solution

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • npsitesafety
  • iTunes Detector Plug-in
  • Next Generation Java Plug-in 10.9.2 for Mozilla browsers
  • Google Update
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • npFFApi
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.4
  • Adobe Shockwave for Director Netscape plug-in, version
  • 5.1.10411.0
  • GEPlugin
  • Google Updater pluginhttp://pack.google.com/
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • getplusplusadobe16291
  • Coupons, Inc. Coupon Printer Plugin
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • Coupons, Inc. Coupon Printer DLL
  • np-mswmp
  • Yahoo! activeX Plug-in Bridge
  • Office Plugin for Netscape Navigator


  • User Agent: Mozilla/5.0 (Windows NT 6.0; rv:16.0) Gecko/20100101 Firefox/16.0

More Information

  • Top 10 Contributor
  • Moderator
2046 solutions 8901 answers

hello Allans, can you check if trusteer rapport is up to date. other users have reported that old versions of it might interfere with flash 11.3 and above & cause hangs or crashes. open the rapport console from the start menu & see if there's a new version available. also make sure that your other security software isn't sandboxing/or blacklisting firefox.exe, plugin-container.exe or FlashPlayerPlugin_*.exe in any way.

in case you can't solve the issue this way, you can also try downgrading to flash version 10.3, which is still supported.

  • Top 25 Contributor
  • Moderator
191 solutions 1967 answers

Chosen Solution

For more information and other suggestions, see this article: http://kb.mozillazine.org/Flash#Flash_Protected_Mode_issues_on_Windows_Vista_and_above