Firefox Not Loading Websites After Update

''locking this thread as duplicate, please continue at [https://support.mozilla.org/en-US/questions/1053378 /questions/1053378]''
Firefox has stopped working after latest update. I can open it up but then it wont load any websites. It just keeps loading. After if I close it and try to re-open it I get the following error message: "Firefox is already running, but not responding. The old firefox process must be closed to open a new window" and it never opens. If I try to end the process in task manager I can't as it doesn't do anything when I attempt to end the process. Then the only way I can get back on firefox is to restart my computer. This is happening on both my PC and my Laptop both running Norton Security Suite.
Please HELP! as I have tried everything and nothing fixes it. I have tried the following troubleshoot solutions with no luck:
1) Reinstall Firefox
2) Refresh Firefox
3) Removing Firefox from the list of accepted programs in firewall and then adding it back (this was done through Norton as it is managing my Windows Firewall)
4) Creating a new profile and using that one instead
5) Starting Firefox in Safe Mode
6) Updating firefox
7) Updating Norton
Nothing seems to be Working and I'm starting to get frustrated. Any Help is appreciated. Thanks

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.
*http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

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