For the past week I am unable to access the web using firefox even after downloading it again, why?

When I click on the firefox icon it was not opening up or it would open then say unable to make connection. I had no problem using Internet explorer. So I thought I should download Mozilla firefox again and I did. It seemed to be functioning but then reverted back to nonresponsive. I am able to contact you using internet explorer. What can i do?

A possible cause is security software (firewall) that 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 from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

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