Windows 7: New FF 4 Details!

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The Firefox button - a new menu button that aggregates the most frequently used browser menu options (default for Windows Vista and 7; can be disabled)
Aero Glass interface - a new skin that fits with the default theme of Windows Vista and 7 (currently only available via third-party plug-ins)
Customizable tab bar - ability to drag buttons around the tab bar
Bookmarks button - opens bookmarks menu and lets you dock it as a sidebar
Tabs on top - now enabled by default and can be changed by user
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