Make sure you are not blocking content.

Start Firefox in Safe Mode {web link}

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

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}acking-protection-firefox-desktop

Hi FredMcD - thanks for your help

I tried your suggestions, with no luck.

- loaded Firefox in safe mode, the problem remains - staying in safe mode, I cleared the whole cache, no change - when I enter 'www.firefox.com' or 'accounts.firefox.com' no page loads, not even the URL - likewise the sign-in to sync button in Preferences does nothing - if I enter 'www.getfirefox.com' I am forwarded to the mozilla site however - my VPN is off, and I've switched to a different wifi network too, still no luck

Do you have any further thoughts?

Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Remove History For One Site {web link}

Open the History Manager <Control> (Mac=<Command>) <Shift> H. In the search bar, enter the name of the site. Right-click on one of the listings and select Forget About This Site. This should remove all information, including any site settings

I found the issue. I run a network monitor in the background and for an unknown reason it was blocking the firefox.com domain within Firefox browser — which is why the URL wouldn't load, but nor would I get an error messages. I think it's solved for now. Thank you for your help though! it was while I was recording a screencast to show the issue I looked at the network monitor and found the problem. Cheers

That was very good work. Well Done.