Not a major problem, just a minor irritant. Sometimes, when I hit the arrow to go back to the previous page, that page is now no longer there, and it skips to the previous previous page. Why would that be?

Could be the button click sensitivity on your mouse is set a little high?
In the meanwhile ...
Have you tried clicking on the tiny black triangle(to the right of the "arrow" buttons) and clicking on the Dropdown menu list of the stored pages?

Another simple way of organizing pages is to open the page via the Right-Click, Open in New Tab.
Each page opened can be read, and then when closed, your next Page is available. If you prefer to not close the window, you can just click on the next tab without closing the current one.

You can see a quick tutorial on this in the Windows Internet Explorer Help file, Internet Explorer Tour. Firefox works in basically the same way (and yes, firefox had this feature first).
Dwight