These candidate builds are now available for testing for each of Windows, Mac and Linux--- with l10n builds to follow shortly. Please note that for our alpha releases there are feature and polish issues that have not yet been completely worked out. We release these milestones to get the core code out to our community to test out major gecko and platform changes as soon as possible. If these test out well, we'll be shipping Deer Park Alpha 2 shortly.
This will be second alpha in the Deer Park product development cycle and will include all major and significant features, whether pref'd on or off in order to achieve wider testing and to solicit quality feedback. The quality standard for this release is pre-production and therefore it should be of the quality required to support testing, and for Extension, theme and web application developers to begin compatibility and feature testing in advance of Firefox 1.1. It may break some but not all 1.0+ targeted Extensions. It should not contain any significant and known crashers.