a few weeks ago i noticed that firefox was running much slower on some websites. today i downloaded version 4.0 in hopes that it might correct the problem but it hasn't. every time i visit sites such as amazon.com, imdb.com, musiciansfriend.com, nba.com and a few others, firefox totally freezes up and it is deemed as not responding in the task manager. I have always enjoyed firefox but if this continues I'm going to be forced to start using Internet Explorer because those sites work fine with that web browser.