I keep searching, but I only find how to read offline. Let me be clear, I don't want to read offline. Amazon only gives you so many downloads, and after that, you need to purchase the book again. I do a lot of linux OS changes and browsers. It is very easy for me to exceed the limit. I've already had it happen to a $40 computer book. When you log onto read.amazon for the first time with a browser, you are asked if you want offline use. I say NO. However the next login automatically sets it on. There are no settings to stop this.
Added (1). This is with Chrome and Firefox.
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How to disable kindle web reader from downloading books?