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This content covers features introduced in Thunderbird 7
Thunderbird 7 is based on Gecko 7.0. The Firefox 7 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 7, see Updating extensions for Firefox 7. There are several key changes that break compatibility with existing add-ons, so be sure to read that article.
Attachment objects in the reader (formerly
createNewAttachmentInfo) are now called
AttachmentInfo. Related functions (e.g.
saveAttachment) have been replaced with methods (e.g.
Address Book RDF Obsolescence