I just noticed that there is a gesture to switch to the next or previous page by incrementing or decrementing the page number in the URL. However this fails if the number is an offset where to start and not an absolute page number. Back in the days of FireGesture you could write your one script that was mapped to a specific gesture. One of the included scripts had a similar functionality to switch between pages. But instead of changing a number in the URL this script searched for a link/button that contained some form of "next/prev" in class/id/text/etc. and clicked on that.