Here's what's new in Firefox 1.5 Beta 1:
Automated update- to streamline product upgrades. Notification of an update is more prominent, and updates to Firefox may now be half a megabyte or smaller. Updating extensions has also improved.
Faster browser navigation with improvements to back and forward button performance.
Drag and drop reordering for browser tabs.
Improvements to popup blocking.
Clear Private Data feature provides an easy way to quickly remove personal data through a menu item or keyboard shortcut.
Answers.com is added to the search engine list.
Improvements to product usability including descriptive error pages, redesigned options menu, RSS discovery, and "Safe Mode" experience.
Better accessibility support including DHTML accessibility.
Report a broken Web site wizard to report Web sites that are not working in Firefox.
Better support for Mac OS X (10.2 and greater) including profile migration from Safari and Mac Internet Explorer.
Many security enhancements.
Download it here-