Mozilla have announced the release of the fourth beta version of the Firefox 3 browser. The fourth beta of the next major Firefox version offers over 900 bug fixes over Beta 3, including improvements in the download manager, full page zoom options, better integration with Vista, Mac OS X and Linux, and significant improvements in speed and memory usage.
The new Windows version can be downloaded from the Firefox beta page and the Mac version can be found here. Full details on all the changes and fixes can be found on the Firefox 3 Beta 4 Release Notes page. Developers should check the The Mozilla Developer News weblog’s announcement of Firefox 3 Beta 4 which includes links of interest.
Other added areas of improvement include an enhanced user interface, richer personalization throughout, improved platform features and performance improvements including the perennial memory leak problem that Firefox suffers from. Note that this beta 4 version is strictly for testing purposes and extensions used in your current version of Firefox may not yet be compatible with it.