Firefox 3 Beta 4 is a developer preview release of Mozilla's next generation Firefox browser.

Alternatively you can download the latest stable version of this software.

Firefox 3 Beta 5 includes more than 750 changes from the previous beta, improving stability and web compatibility, providing platform and user interface enhancements, and resulting in the fastest Firefox ever. Many of these improvements were based on community feedback from the previous beta.

More Secure

One-click site info
Malware Protection
New SSL error pages
Add-ons and Plugin version check
Secure add-on updates
Anti-virus integration
Vista Parental Controls
Easier password management
Simplified add-on installation
New Download Manager
Resumable downloading
Tab scrolling and quickmenu
Save what you were doing
Optimized Open in Tabs behavior
Location and Search bar size can now be customized with a simple resizer item.
Text selection improvements
Plugin management

[Improved in Beta 5!] Integration with Windows: Firefox now has improved Windows icons, and uses native user interface widgets in the browser and in web forms.

[Improved in Beta 5!] Integration with the Mac: the new Firefox theme makes toolbars, icons, and other user interface elements look like a native OS X application.

Firefox also uses OS X widgets and supports Growl for notifications of completed downloads and available updates. A combined back and forward control make it even easier to move between web pages.

[Improved in Beta 5!] Integration with Linux: Firefox's default icons, buttons, and menu styles now use the native GTK theme.

More Personal

Star button: quickly add bookmarks from the location bar with a single click; a second click lets you file and tag them.
Tags: associate keywords with your bookmarks to sort them by topic.

Location bar & auto-complete: type in all or part of the title, tag or address of a page to see a list of matches from your history and bookmarks; a new display makes it easier to scan through the matching results and find that page you're looking for. Results are returned according to their frecency (a combination of frequency and recency of visits to that page) ensuring that you're seeing the most relevant matches. An adaptive learning algorithm further tunes the results to your patterns!

Smart Bookmarks Folder: quickly access your recently bookmarked and tagged pages, as well as your more frequently visited pages with the new smart bookmarks folder on your bookmark toolbar.

[Improved in Beta 5!] Places Organizer: view, organize and search through all of your bookmarks, tags, and browsing history with multiple views and smart folders to store your frequent searches. Create and restore full backups whenever you want.

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