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    Thunderbird 6 for developers

    This page is not complete.

    This content covers features introduced in Thunderbird 6

    This page lists the changes in Thunderbird 6 that are relevant for developers. For changes that are relevant to end users, see

    Gecko 6.0

    Thunderbird 6 is based on Gecko 6.0. The Firefox 6 page has details on the significant changes to Gecko.

    Changes for Mozilla and add-on developers

    For helpful tips on updating existing extensions for Thunderbird 5, see Updating extensions for Firefox 4. There are several key changes that break compatibility with existing add-ons, so be sure to read that article.


    Backend changes


    Other Changes


    More resources

    Document Tags and Contributors

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    Last updated by: chrisdavidmills,