Extensions allow you to add features particular to your needs such as offline mail support.

UI extensions can be added to Mozilla Thunderbird to customize your experience with specific features and enhancements that you need.

Choose View / Toolbars / Customize inside any window.

The ability to customize your toolbars the way you want them.In addition to the feature set found in Mozilla Mail, Mozilla Thunderbird has several new features and improvements to make your mail and new experience better. On top of that, the UI becomes much cleaner as a stand alone application as opposed to being part of the mozilla suite. In addition, by focusing solely on stand alone mail, we believe we can make some dents in the overall footprint and performance of the mail client by removing components and chrome we don't need. Our intended customer is someone who uses Mozilla Firefox (or another stand alone browser) as their primary browser and wants a mail client based on mozilla that 'plays nice' with the browser. Our goal is to produce a cross platform stand alone mail application using the XUL user interface language. Mozilla Thunderbird is a redesign of the Mozilla mail component.

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