Hi Joe: I wouldn't mind giving up Sierra if I knew for a fact that it is the culprit of my bad experience on Amazon.
It could be the problem is not with Sierra, but the version of Safari in Sierra. You might try downloading, installing, and running either Google Chrome or Mozilla Firefox and see if they fix the problem.
Even if that fixes your problem, my strong recommendation to upgrade to Catalina still stands. Catalina is many times more secure from outside manipulation than Sierra and given the sophisticated exploits out on the internet, we all need all the protection we can get. Besides that you might discover a lot of cool new features and there are a lot of new apps are not compatible with Sierra. And in general Catalina has been a problem free version of MacOS from day one.
If we knew what it was we were doing, it wouldn't be called research, would it?
