The latest version of Mozilla Firefox, version is almost ready for prime time. It is now in Beta 4 and there are some marked improvements:
One of the most notable improvements is performance and memory usage. Since version 2 of Firefox, after a while it would become non-responsive and I would have to force-quit or terminate the browser. I use Firefox on a Mac, but I heard the same complaints from Windows users. There were memory leaks in Firefox that were so bad it would eventually consume up 1.5 GB of real memory on my system and slow everything else to a crawl until I killed and restarted it. Grant it I am a heavy browser user. I always have multiple tabs open and a lot of extensions installed. I use my browser to access and edit wiki's, blogs, email, Flickr and Google Docs. The browser is the one application I start and end my day with and use all of the time. I started using Safari for sites that I did not need Firefox's javascript compatibility or extensions for, but it is cumbersome to be switching back and forth between browsers. Firefox 3 appears to be handling memory usage much better, as well as, just rendering web pages faster.
The new full page zoom is a great accessibility feature. From the View menu and via keyboard shortcuts, the new zooming feature lets you zoom in and out of entire pages, scaling the entire layout, including text and images, or optionally only the text size. Your settings will be remembered whenever you return to the site. Previously, you could increase text size, but if the layout was not fluid, it could get distorted.