Get an ipad or kindle for ebooks. Both do a good job, ipad costs a little more, but it does so many other things. For reading on your laptop, you need to get safari.
It has a reader function that displays text in a format that is like an ebook, very readable. Firefox has a puffin like that, called readability, but it is not as slick.
Somehow my smartphone transformed the word addon to come out puffin.What’s a puffin?