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This type of crash can happen due to a corrupt font cache after upgrading to Mac OS X 10.6 (Snow Leopard). To clear the font cache:
- Restart your Mac in Safe Mode. See Apple.com: Starting up in Safe Mode for instructions.
- After starting in Safe Mode, restart your Mac normally.
For troubleshooting other types of Firefox crashes, see Troubleshoot Firefox crashes (closing or quitting unexpectedly).