Last week I started having a bunch of problems when visiting some of my favorite sites.  Certain sites would freeze up both Firefox and Safari when I visited.  Since I hadn't had any problems with these sites for as long as I could remember and hadn't updated my browsers lately I was confused about what migh tbe going wrong.  After a couple days of getting annoyed and having to restart my browsers I had a revelation.  I had recently installed Silverlight 2 Beta 1, and all the sites I was visiting had flash on their homepage.  It turns out that something with Silverlight 2 made it so flash broke.  I ended up manually uninstalling Silverlight, restarting, and all was good again.