Greetings, Emma and Andrew...
Thank you very much for your quick replies to my bug report!
To answer Emma's question, no I am not using Kapersky. My antivirus software is Avast.
I was about to go to support when Andrew's reply appeared, so I decided to select the https://firefox-storage-test.glitch.me that appears in his reply. As a result, the following text appeared:
If this doesn't go away, things are unexpectedly broken.
So, does this mean that I need to Refresh Firefox and this should fix this problem? I've used the Refresh Firefox previously, a number of years ago. What data/settings will I lose if I perform a Refresh Firefox now? Please advise. I don't want to lose stored passwords.
I've second computer that also has Firefox web browser installed, and which was just updated from Firefox Quantum to Firefox Browser 7.0. I just attempted to access the Bank of America website and it appears to work, compared to the experience contained in my above bug report for the computer that I'm currently using to type this message to you. However, I've not performed a thorough test yet.
Q: If my Firefox web browser had a large number of open tabs that remained open during the update from Firefox Quantum to Firefox Browser 7.0, could the multiple open tabs corrupted the update process? Just a thought...