Firefox scrolls slowly on websites with background images.
I find that when I go to websites that have background images, such as my tumblr (deshaunic.us) or the call of duty websites (http://www.callofduty.com/missions), scrolling is very slow and stutters, even though I have smooth scrolling enabled.
I have not had such issues with IE. I also have not had these issues on a different machine running Firefox 4 beta.
Wšykne wótegrona (1)
A workaround is to use a bookmarklet to make the background scroll.
This code may not work on all sites, only if the background image is attached to the body.
javascript:void(document.body.style.backgroundAttachment='scroll');