Thought i'd review this since i DLoaded and tested BETA 4 starting about a month ago...
Plus Side
The memory issues seem to be addressed nicely. If leaving a browser session open before for any length of time (over 5 hours ) i would have to re-boot or re-start FireFox2 to get it to stop hiccups.
Overall response is from my estimates about a third faster.
The profile i had from my older ver. imported seamlessly and all bookmarks, themes and extensions were intact.
My initial tests were done on the Portable version running off a flash drive...no issues at all. I have since installed the full ver. to the Desktop.
Both load times and shutdown appear to be quicker as well.
Minus Side
A new Google bar at the upper right is larger but can be resized.
They automatically added new features which you may or may not like including Smart Bookmarks; a new Home bar; and a new default theme which is too Vista-like for my tastes. Fortunately as with all FireFox releases all of the above can be individually tweaked or removed.
Overall Grade
I'd have to give it between an A- and a B+ mostly for the performance issues that have been addressed. The browser itself as i stated is still as customisable as before. I have had zero issues and ran this so i could provide feedback to Mozilla on the BETA release to help the development but i'd say it's safe to run on most machines for now...just keep ver.2 installed as well as a backup of your profile and you should be good to go.
patio.
FireFox3 BETA4