[[replying to the now deleted comment: “if you really needed them, you would have processed them”]] Nah, it’s not a matter of “needing” them or not. There are plenty of things that you don’t need per se, but still make your life a lot better if you have them.
I also have a long backlog of books I want to read but haven’t yet read. That’s a good thing: it means that every time I finish a book I have a large menu of options to choose from for what book to read next, ones that I have already decided are worthwhile for me to read. To discard that backlog of books would be absurd: what harm does it do to me that I have pre-selected some options for what to read next? Yes, I don’t need to read any specific one of those books, but all in all I like to read books, and keeping track of “books I want to read” means that always have available a large selection of them.
Of course, as with any backlog, it’s a good idea to not let that backlog of books grow too far out of control. But that’s not too hard: I’ve got good tools, like Beeminder, that can help me manage it.
Everything I just said about books also applies to web pages. All the more so, because a book will often get read over days or weeks, whereas a web page is generally short enough to be read in a single sitting.
So yes: I have a backlog of books, and separately a backlog of tabs (that is, web pages.) Both serve a similar purpose, and to discard either one of them would be a loss to me.