#  (Firefox 57 and above) Click the Library button  and choose History.

#  Under "Time range to clear", select "Everything". 

# From the details list, check Cache and Cookies and uncheck everything else. 

HI,welcome not a issue; it is to get you working again. it seems I have no problem getting past the Login Icon and to the Login Page of https://personal.natwest.com/personal.html which also states it is using a signed Symantec Certificate. Is this where your problem is or is it before that ? If so for both is to do the follow : Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following: # (Firefox 57 and above) Click the Library button and choose History. (Click the menu button and choose History in older Firefox versions.) # In the History menu, choose "Clear Recent History...". # Under "Time range to clear", select "Everything". # Now, click the arrow next to Details to toggle the Details list active. # From the details list, check Cache and Cookies and uncheck everything else. # Now click the "Clear Now" button. Further information can be found in the Delete browsing, search and download history on Firefox article. Did this fix your problems? Please report back to us! As did mention if issue is still there then it is a site issue with that certificate. Please let us know if this solved your issue or if need further assistance.