I have made a subfolder for the read-later. It's continuosly growing and once in a while I clean up - often just kicking out stuff without reading. It's working nice for just moving the "I might read this later" somewhere. I don't have to think about which subfolder it needs to go in and it's out of the way fast.

One annoying feature in Firefox is that "Bookmark this page" always puts stuff in the last subfolder used. I often end up with bookmarks not just in the wrong subfolder, but also without an idea in which one they have landed. So I create a new bookmark just to figure out where the last one has landed ... sigh