Try resetting your network settings.. this can be done manually by command prompt. Steps: 1. open command prompt admin priviliges( in windows search-> type cmd -> right click "run as administrator" 2. enter the following commands:

ipconfig /flushdns
netsh winsock reset

See if problem is fixed

It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/en-US/kb/server-not-found-connection-problem
• https://support.mozilla.org/en-US/kb/Firewalls
• https://support.mozilla.org/en-US/kb/fix-problems-connecting-websites-after-updating

I remembered that Intel also updated the driver on the chip-set so I reinstalled the VGA driver and problem was solved. So either during the process of the Windows 10 or Intel upgrades the VGA driver files were corrupted and reinstalling the driver solved the issue.