Did this start with the last update? What Firefox were you using before?

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

• Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
• Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}

It did start after the last update. I don't know what version I was using before. I assume the one just before this one since I always keep Firefox up to date. I have already checked my firewall, Firefox is an allowed program and I've completely uninstalled my antivirus so tht is not interfering with it either. I have no other internet security currently installed

jrkonkolesky said

I have already checked my firewall, Firefox is an allowed program

FredMcD said

Some problems occur when your Internet security program was set to trust the previous version of Firefox

This means the firewall knows v55, but not v56 (example).

I have removed Mozilla from my firewall completely. Restarted the computer. And re-added it to the list of programs allowed through the firewall. It still does not load any web pages.

I have even turned the firewall off completely and tried Mozilla with the same problem. Firefox won't load any pages

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select Network.

[56+] Type about:preferences#general<enter> in the address bar. Look for Network. +++++++++++++++++++++ Look for Configure How Firefox Connects and press the Settings button. If you are using a proxy, make sure those settings are correct. If there is no proxy, first try No Proxy. If there is a problem, then try System Proxy.