When I'm on Tumblr, scrolling through my dashboard, I noticed that after a while it gets very slow. The reason why, is that everytime I scroll down a bit or press the 'j'-key (to go to the next post), firefox/tumblr already loads a next page of my dashboard. So by the time I go down by 20 posts, I already got 20 pages loaded. And when I finaly reach the end of all the new stuff since the last time I checked Tumblr, Firefox is very slow because of the (probably) thousands of posts that it has loaded. It should load the next page when I'm (almost) at the end of the last page. when I look at my scrollbar to the right, it also shows a very small bar that is only at about 20% of the track. As shown in this image (this is only after pressing the 'J'-key 20 times): http://i.imgur.com/4vkkpEG.png I'm using Waterfox (a version of firefox specially made for 64bit systems) but this also happens with the normal firefox. It doesn't happen in google chrome or internet explorer. I have used the tumblr savior addon before this started happening but I've disabled and uninstalled that a while ago and I also made a new profile to see if that fixes it (it didn't).