The more recent versions of Firefox 2 don't have an email button, but you can install the
Toolbar Buttons add-on
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This Extension adds buttons to the Customize Toolbar Window. To move them from there to the Toolbar you must right click the toolbar and press customize select what buttons you want to use and drag them to the toolbar.
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Drag the email button from the list onto your toolbar. Clicking it will open your default email program.