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Flash Player Crashing After Updating to FF 15


Just updated to FF 15 and the Flash Player crashes any time I load a page with a Flash object. I'm running Flash 11.4 r402 on Windows 7 32bit. I tried safe mode and that did nothing to solve the problem. All help appreciated.

Chosen solution

Ok it seems the best temporary solution to this problem (until they release a new version of flash) is to uninstall Adobe Flash Player and then download an old version of Adobe Flash Player (11.2 worked for me - don't use 11.3 because it has problems too).

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.4 r402
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.4
  • Adobe Shockwave for Director Netscape plug-in, version
  • VLC media player Web Plugin 2.0.2
  • Next Generation Java Plug-in 1.6.0_33 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • npdivxplayerplugin


  • User Agent: Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20100101 Firefox/15.0

More Information

romaba 0 solutions 2 answers

Thanks JacobBruce for your solution.

SharkeyHerald 1 solutions 10 answers

At present the problem seems to have disappeared as mysteriously as it (re)appeared. So I will wait and see. But if it comes back I will try CheckMate's solution. Thanks.

cutmetal 0 solutions 23 answers

I was having the same problem.... But I keep forgetting that when you upgrade firefox... or it updates automatically... you need to right click on the firefox start up icon, go into properties, click on the compatibilities tab, and put a check in the "Run This Program As An Administrator" box, then hit apply. Start Firefox, and it should work OK. Problem is...each time you upgrade firefox and/or I think Adobe flash... you need to make sure that box is checked. This is on Firefox 15.0.1 with Adobe Flash 11.4.402.278 all up to date, Windows 7 64bit. If Firefox has Adobe flash add-on, it needs to run in admin mode or it will crash.

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190 solutions 1961 answers


Checking your username for previous posts (here) I see that you also posted the same information in a number of other threads today.

You don't normally need to check the "Run This Program As An Administrator" box in Firefox -> Properties -> Compatibility tab, to prevent crashes after updating Firefox or Flash. If you need help with this issue, you should ask a new question. You can use this link as a starting point: https://support.mozilla.org/questions/new

Modified by AliceWyman

SharkeyHerald 1 solutions 10 answers

Well, I checked the "run this program as an administrator" box and the problem stopped, After about a week I thought I'd see what happened if I unchecked the box, and the problem started again. So I'll keep the box checked, even if it makes starting the program slightly slower.