为什么隐藏侧边栏的Greasemonkey JQuery脚本可以在Stack Exchange站点上运行，但不能在Stack Overflow上运行？

I get distracted by the Related Questions and Hot Network Questions in the side bar, so I wrote a Greasemonkey script to hide them. The script works on Stack Exchange sites, but not on Stack Overflow itself. I get distracted by the Related Questions and H