On a Fire tablet, open a book and tap the page, then tap Font (Aa) > Layout > Black. This article explains how to use Dark Mode on Kindle. The information applies to certain Kindle models made in ...

But if you have an old Fire tablet, you might think it isn't worth a lot anymore. While you can still use it as a Kindle or as a tablet, you may have upgraded to a nicer version of the Kindle or ...

In the intervening time, competitor Barnes & Noble Inc. has launched a Nook e-reader with a built-in screen illuminator for reading in the dark. Amazon itself was the main outlet for the Kindle Fire.