Web pages will not load

My web pages do not load in Firefox whether I try from my Bookmarks or by typing the web address.
They load fine in Chrome or Explorer.
Here's what happens: Whatever way I choose to access a web page (bookmarks, typing web address, making a search) I see the "Connecting..." in the tab for a few seconds and then nothing. The tab returns to "Mozilla Firefox Start Page".
Here's what I've tried:
Restarting in safe mode with Add-Ons disabled
Reseting Firefox
Reinstalling Firefox
Restarting the computer

A possible cause is security software (firewall,anti-virus) 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 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 internet 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
See also:
*http://kb.mozillazine.org/Error_loading_websites

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