Flashplayer crashes using firefox with Windows 10

In general, the classic Firefox stability issue is related to the bolt-on NPAPI sandbox that we added for 32-bit Firefox.  Our solution is sub-optimal, but necessary to provide modern security mitigations to 32-bit Firefox users.  We're optimistic that Mozilla will implement a native sandbox for 32-bit Firefox, but it's not there yet.  This problem seems to be exacerbated in Win8+, but it has to do with the number of messages being sent between Firefox and Flash exceeding what the system can do reliably.

In 64-bit Firefox, Mozilla has implemented a native NPAPI sandbox.  The architectural efficiencies resolve the classic hang for most people.

To install 64-bit Firefox, you can download it it from this page.  Just make sure you're picking the 64-bit version that's listed.

https://www.mozilla.org/en-US/firefox/all/

You should just get the 64-bit player automatically.  We install both automatically when you install the NPAPI plug-in on a 64-bit machine.

If the crashes persist, something else is going on.

If you go into about:crashes in Firefox, you'll see a list of recorded crashes. Right-Click each of the crashes and choose Open In A New Tab.  Firefox will then submit them to Mozilla for analysis.  The names of the links themselves will change to start with bp-<something>.  If you can reply with a list of those IDs, I'll be happy to take a look and see if there's any useful information.

While you're waiting for a response, you might want to try disabling hardware acceleration, which is described in the video troubleshooting guide below:

https://helpx.adobe.com/flash-player/kb/video-playback-issues.html

Thanks!

is your operating system 32 or 64 bit?

If you don't know Google it