Could you try starting up in Firefox's Safe Mode? Simply hold the Shift key when double-clicking the Firefox icon.

When you get the dialog, do not check any boxes, just click Continue in Safe Mode. Will Firefox start?

The crash you are experiencing is being tracked at Bug 734921. Can you start Firefox in Safe Mode? Diagnose Firefox issues using Troubleshoot Mode

If Safe mode works then try to disable hardware acceleration

• On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://hacks.mozilla.org/2010/09/hardware-acceleration/

• https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers

Looks like resetting your Firefox home page to something other than Google may resolve the crashes, so restart in Firefox Safe Mode if possible (click "Continue in Safe Mode") and follow the steps in How to set the home page.

If Firefox won't let you run it without crashing, even in Firefox Safe Mode, restart Firefox again by holding down the SHIFT key while you double-click the Firefox icon, then select the troubleshooting option, Reset all user preferences to Firefox defaults and click "Make changes and restart". This will reset all modified preferences, including your Firefox home page, which will be reset to the default "about:home".

Ref:

• https://support.mozilla.org/questions/934130 firefox 14 crashes when home page is google .com
• http://forums.mozillazine.org/viewtopic.php?f=38&t=2511743 Firefox 14.0.1 crashing