Hello dan197, we're sorry to hear that Firefox is crashing when you open it. Please do the following to give us crash IDs that will help us understand more about the crash.

Click the Finder icon in the dock. On the menu bar, click the Go menu, hold down the option or alt key and select Library. A window will open containing your Library folder. Then open the "Application Support" folder, the "Firefox" folder, the "Crash Reports" folder and finally the "submitted" folder.

1. Open the 5 most recent files with a text editor and copy the IDs.
2. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

You can check for corrupted and duplicate fonts and other font issues:

• http://www.thexlab.com/faqs/multipleappsquit.html - Font Book 2.0 Help: Checking for damaged fonts
• http://www.creativetechs.com/iq/garbled_fonts_troubleshooting_guide.html

bp-8ef03acd-7e89-4470-8c13-4b4e62141106 bp-edf39b18-c9f4-41da-b931-572522141106 bp-124bf559-bdb1-43bc-896c-436e22141029 bp-6c81a890-a00e-4656-a4c4-a14ea2141027 bp-0c22ec52-65fd-4b28-bfef-5d5c62141023

These programs were flagged in your crash reports;

fbplugin = FaceBook

libdyld.dylib = Microsoft Office ?

libsystem_kernel.dylib =

libsystem_pthread.dylib = BetterTouchTool ?

libdispatch.dylib

That is a problem with the "Facebook Photo Uploader" (fbplugin).

• bug 1086977 [10.10] Facebook's old "Facebook Photo Uploader" (fbplugin) crashes on load on OS X Yosemite

Thank you. How do I fix that?

You would have to remove that plugin from the /Library/Internet Plug-Ins/ folder.

You can find the installation path of all plugins on the about:plugins page.

• http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins