Each time when I select "mark as read" on a thread on the page "new messaegs (some number)" of my personal user-specific links, the page is redisplayed and both paging and scrolling are started from the newest thread. Since I do not mark newer threads as read before having read then, and I read them in roughly chronologial order, I have to page back to where I was before, then scroll down to where I was before, and continue reading. With several 100 threads and messages, this is extremely time consuming. I spend a magnitude more time waiting for pages to be sent to me just to immediately go to the next page, and scrolling down than actually reading. Unfortunately I do not have a choice to avoid using this extension, else I would.
Thus I suggest to include the parameters of the respective next or previous thread in the "Mark as read" link.