The problem is, though, Firefox Quantum just updated to 63.0 and the beta version 5.27.1 is now broken. I registered on the Sandboxie forum with this issue but it is awaiting review. This makes software #3 that has died on the vine with Windows 1809. Stable Sbie won't run on v.1809 at this time. So, using Internet Explorer in Sbie beta for now.