Firefox crashes due to old Google Desktop versions
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The template "crashsig" does not exist or has no approved revision. GoogleDesktopMozilla.dll@0x5512, GoogleDesktopMozilla.dll@0x5500, GoogleDesktopMozilla.dll@0x56bc or GoogleDesktopNetwork3.dll@0x3dfb
Firefox can crash on startup when some files from older versions of Google Desktop are still present. This can happen even if you have the most recent version of Google Desktop.
If you are not using Google Desktop, try the solutions in Firefox crashes - Troubleshoot, prevent and get help fixing crashes.