So every edition of Firefox is getting slower?
I would think so. While I haven't run specific tests, it sure seems like Firefox is becoming more and more of a memory hog. That's the SAME thing that Mozilla.org was criticizing IE about. However, Firefox is STILL more secure than IE 7 and previous. I don't know about IE8. I don't use that at all.
What I DO know about Google Chrome is that I tried it, it didn't work with many websites, especially java and active x controls. Of course, that was early on and may have even been a beta version. Then there was Google's EULA......