I tried it a few days ago, and my cpu was running 100% with 3 tabs open. I was watching a YouTube video in the process. The video was sluggish. I downloaded Opera, and didn't have a problem. I went back to Firefox 3.6., but had the same problem! I really like FF, but it's annoying to deal with at times. Opera and Chrome's extentions aren't that freat to me. Especially when it comes to blocking ads. Any help would be appreciated. Thanks.
Windows XP Pro
Version 2002
Service Pack 3
Celeron(R)CPU 2.66GHz
2.67GHz. 248 MB of RAM