The template "crashsig" does not exist or has no approved revision. NPSWF32.dll
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.
- For troubleshooting other crashes, see Troubleshoot Firefox crashes (closing or quitting unexpectedly).
Table of Contents
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 Update Firefox to the latest release.
Conflict with extensions
Firefox extensions can cause this crash. To test whether your crash is happening because of an extension, try launching Firefox's Diagnose Firefox issues using Troubleshoot Mode:
Click the menu button 
, click , select and click in the Restart Firefox in Troubleshoot Mode? dialog.
firefox -safe-modeYou may need to specify the Firefox installation path (e.g. /usr/lib/firefox).
- In the Firefox Safe Mode dialog, click .
- 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 Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.
- 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 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 Adobe.com's article on uninstalling Flash.
- To re-install Flash, go to the Adobe Flash Player download page.
- Click the button to download the installer.
- After you've downloaded the installer file, double-click it and then follow the on-screen instructions.
- Restart Firefox.
