OK tried everything I can think off.
Even uninstalled every trace of FireFox.
Rebooted laptop and installed from scratch latest version of Firefox.
Before I reinstalled any of my Bookmarks I tested GPSPower.net in the search window.
This just started Yesterday other than that there has been no problems to access the site.
It could be something to do with Firefox and the latest version.
For now I will use WaterFox or Internet Explorer to access the forum.
This only happens on GPSPower forum that I have run into.
Bookmarks