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}

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Thanks for the reply

I'm unable to start Firefox in safe mode.

I've checked the firewall settings and its enabled there (image attached)

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Hi

I'm unable to start Firefox in safe mode. When I hold shift key and open Firefox app nothing happens

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

Hello

Firefox works when I start my computer in safe mode. No problems So what next?

Thanks

As a test, disable your protection programs. Then try going to Mozilla.org

I have resolved the problem by updating my Windows Security settings. I needed to exempt Firefox from Export Address Filtering

Thanks for the help

That was very good work. Well Done.