Mozilla Firefox 3.7 which is under progress and it has been announced that Firefox 3.7 will support Aero Glass and will have a brand new interface. Firefox 3.7 Alpha 4 will come with the 1.9.3 Gecko engine, and also includes new icons and other features which makes Firefox a bit faster than the earlier versions. FireFox 3.7 Pre-Alpha4 is out there for downloads for Mac, Windows and Linux.
Gecko 1.9.3 Alpha introduces new features which is usually tested by using this Mozilla Developer Preview. Numerous of these characteristics are nevertheless in progress, and even though they will likely appear in some future version of Mozilla Firefox, some might be in previously releases than others.
Performance - An experimental Direct2D rendering backend on Windows is available, turned off by default.
JavaScript - Significant API improvements are available for JS-ctypes, a foreign function interface for extensions. ctypes.jsm now supports complex types including structures, pointers, and arrays.
Stability - Mozilla now uses an infallible allocator: if a request for memory cannot be fulfilled, the allocator aborts. This allows for simplification of the Mozilla code, as well as preventing a class of security errors with unchecked null pointers.
Additional fixes for multi-process plugins - crash and hang fixes, the Foxit Reader and Octoshape plugins work correctly, Performance improvements in the delivery of network streams.

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