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If Firefox is crashing when you try to view videos on YouTube, it is usually caused by the Flash plugin conflicting with one of your extensions. This article shows what you can do to narrow down which extension is causing problems, and how you can update the Flash plugin or Firefox itself on Windows.

[[T:crashsig]] '''NPSWF32.dll@0xn''' or '''Fn___________''' or '''@0x0 | Fn___________''' If Firefox is crashing when you try to view videos on YouTube, it is usually caused by the [[Managing the Flash plugin|Flash plugin]] conflicting with one of your extensions. This article shows what you can do to narrow down which extension is causing problems, and how you can update the Flash plugin or Firefox itself on Windows. * For troubleshooting other crashes, see [[Firefox crashes]]. {for mac,linux}{note}'''Note''': This article applies to the Windows version of Firefox only.{for mac} For Flash related crashes on Mac OSX, see [[Pages that use the Flash plugin crash on Mac]].{/for}{/note}{/for} __TOC__ {for win,linux} = Update Firefox = Firefox 3.6.4 and above load plugins separately from Firefox, allowing Firefox to stay open if a plugin crashes. To make sure you are using the latest version of Firefox, see [[Updating Firefox]]. {/for} = Conflict with extensions = Firefox extensions can cause this crash. To test whether your crash is happening because of an extension, try launching Firefox's [[Safe Mode]]: # [[T:safemode]] # In the Firefox Safe Mode dialog, click {button Continue in Safe Mode}. # Attempt to view videos to test for the crash. #* If the problem does not occur in Safe Mode, an extension is likely the cause. To narrow down which extension is causing problems, see [[Troubleshooting extensions and themes]]. #* If the problem still occurs in Safe Mode, follow the instructions in the next section of this article. = Flash plugin = The NPSWF32.dll file is associated with the [[Managing the Flash plugin|Flash plugin]]. If the crash still happened in Firefox's safe mode, try uninstalling and re-installing the Flash plugin: # For instructions on uninstalling the Flash plugin, see [http://kb2.adobe.com/cps/141/tn_14157.html Adobe.com's article on uninstalling Flash]. # To re-install Flash, go to the [http://www.adobe.com/go/getflashplayer Adobe Flash Player download page]. # Click the {button Download now} button to download the installer. # After you've downloaded the installer file, double-click it and then follow the on-screen instructions. # Restart Firefox.