Mozilla Firefox 3 is focused on improved memory handling, performance, and stability, improved XUL, and new core components such as application data stored in SQLite. Mozilla Firefox 3 could break a few existing extensions and applications built on top of Firefox, and it will definitely include new optimizations if you like to build on the popular browser. Mozilla Firefox 3 should have additionaljava*script and SVG features if you're into that sort of thing.

Improved Tabbed Browsing
We love tabs as much as you do, so Firefox will open new web pages in tabs by default. Each of those tabs has its own close button, but don’t worry - if you accidentally close a tab, just go to the History menu to bring it back from the list of “Recently Closed Tabs.” You’ll never be crunched for space anymore, either. When you have too many tabs open to comfortably fit in a single window, scroll arrows will appear on either side, and a button on the right side will always show you an easy-to-read list of all your open tabs.

Spell Checking
Sometimes you’re in a rush, and can’t remember if it’s “i” before “e” or the other way around. Firefox has built-in spell checking to keep you from making any mistakes in your blog posts and Web-based email, so you can worry about more important things.

Search Suggestions
Some of the search engines in Firefox can read your mind, and actually suggest search terms for what you’re looking for. Just start typing into the Search bar, and a drop down list of suggestions will appear. (Works for Google, Yahoo! and Answers.com.)

Session Restore
Losing your place while you’re doing things on the Web is a pain. Now, with Session Restore, if Firefox has to restart or closes when it comes back you’ll pick up exactly where you left off. The windows and tabs you were using, the text you typed into forms, and the in-progress downloads you had running will all be Restored. You can even set Firefox to always restore your previous session instead of loading a home page, so you’ll never lose your place again.