In stumbleupon toolbar for Firefox there is a "92" text is displayed in above pic, these are basically sites sent to me by my stumbleupon friends, so whenever I have sites from my friends, there in the toolbar and when I clicks the Stumble button then it shows those sites to me instead any new site.

You can say these are link are like new mails, so there are 92 new mails for me, but I don't want to check those I just want to mark them as read in a single click, and move further to read other old mails.

So Is there any option to mark these sites (sent to me by my SU friends) as read, so that when I click Stumble button then new sites will be shown instead sites which are sent by my friends??