Thunderbird 6 for developers

This is an archived page. It's not actively maintained.

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