Mozilla released developer preview of their next generation browser Firefox 3 Beta 1 and is made available for testing purposes. If you are planning to try out the new beta, please note that, FireFox 3 overwrites previous versions in your system. Also the extensions installed under Firefox 2 may be incompatible and/or require updates to work with Firefox 3 Beta 1.
Some New Features I like with FireFox 3 are
Offline Web support: FireFox 3 supports offline apps. For example, you compose Web mail while offline and send after you are back online. In order to use this feature, developers have to add the Firefox offline functionality to their sites.
One click site info: Click the favicon in the location bar to see who owns the site.
Anti-virus integration: Firefox will inform anti-virus software when downloading executables.
Integration with Vista: Firefox’s menus now display using Vista’s native theme. Respects the Vista system-wide parental control setting for disabling file downloads.
Easier password management: an information bar replaces the old password dialog so you can now save passwords after a successful login.
Resumable downloading: users can now resume downloads after restarting the browser or resetting your network connection.
Optimized Open in Tabs behavior: opening a folder of bookmarks in tabs now appends the new tabs rather than overwriting.
Star button for bookmarking: quickly add bookmarks from the location bar with a single click; a second click lets you file and tag them.