Firefox will not open any webpage - including google, youtube and firefox help.

Firefox won't open anything. This includes support.mozilla.com - I am currently using my back-up browser, Internet Explorer.
Firefox is enabled to access the internet, and browser cookies are not blocked.
All it says every time I try to open any webpage is 'Firefox can't establish a connection to the server at [address of site].' and 'Unable to connect.'

After upgrading, sometimes your firewall will not recognize the new Firefox version and, therefore, not allow it to access the internet. To remedy that situation,
#you must remove Firefox from your firewall's allowed applications list,
#then restart firefox, go to a website, the firewall will detect the new Firefox version and
#then give the necessary permissions for your firewall to allow Firefox access to the internet
Click here for more information --> [https://support.mozilla.com/en-US/kb/Cannot%20connect%20after%20upgrading%20Firefox Cannot connect after upgrading Firefox]
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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