Firefox won't open in Windows 8.1 after latest update failed to install

Latest update for firefox failed to install.
Now, when I try to open firefox, I get the hourglass circle and then....Nothing. Check the processes and it is showing as a background process, but not doing anything. No error message, no crash alert.
So, I uninstalled firefox. Download the installer. Open the installer and...nothing. Again the process is there but nothing is happening.
Tried killing all processes and rebooting and trying the re-install. Still nothing.
The only thing I haven't checked is Nortons Firewall but I thought I might as well ask while I am at work if there is anything else I should check.
Was working fine until this update failed. On Win8.1

I would try restoring preferences: Restore preferences | Dreamweaver CS4, CS5, CS5.5
If that doesn't work, a Clean and Reinstall might do it...
Use the CC Cleaner Tool to solve installation problems | CC, CS3-CS6

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In Task Manager, does '''firefox.exe''' show in the '''Processes''' tab?
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<hr width="200">
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