Whenever I try to open Firefox it says cannot establish connection, maybe your firewall is preventing us from accessing the web.

Whenever I try to open Firefox it says cannot establish connection, maybe your firewall is preventing us from accessing the web. Even though I've let Firefox through my firewall, this message still appears. And whenever I try to redownload it, it just says installation failed. It does this with all installations... Is there something wrong with my computer? How do I fix it?

Sometimes you only disable the user interface of security software, but the firewall or anti-virus services are still running in the background.
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 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
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

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