Mozilla has just released the latest beta version of Firefox 4, beta 9, bringing them closer to a release candidate and final version release in February 2011. There’s still one more beta to pump out, though. In this new beta release, there aren’t any new features but just some tweaks and bug fixes.
Mozilla Firefox 4 Beta is based on the Gecko 2.0 Web platform. In this release, Mozilla has overhauled the bookmarks and history code, enabling faster bookmarking and startup performance. Per-compartment garbage collection is now enabled, reducing work done during complex animations.
Tabs are now on top by default on Windows, Mac OS X, and Linux. You can turn any tab into an “App Tab” by right-clicking on it and selecting “Make into App Tab” from the context menu. The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux. Crash protection for Windows, Linux, and Mac OS X when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins. Firefox 4 beta now comes with native support for the HD HTML5 WebM video format.
This Firefox 4 Beta is considered to be stable and safe to use for daily web browsing, though the features and content may change before the final product release.