You should contact FR on how to use their software with Firefox

What OS? What version of Firefox? It works for me. see screenshot

Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

Did you clear your browser cache? https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox

Try to clear all items for a single site. https://support.mozilla.org/en-US/kb/remove-websites-address-bar-suggestions

Thanks for your suggestions. Checked drivers - all OK. In the end I uninstalled Firefox and re-installed. Problem solved. Must have been some corruption.

Great. Close this "ticket" by marking it resolved and get back to the crowed skies.  ;-))