Windows/Mac: Email client and attachment aggregator Postbox shows off its Mozilla roots by adding support for add-ons—many of them out of the Thunderbird community—in its latest beta release.

Update: Apologies for the typos and incomplete headline in an earlier version, the result of an accidental publish button pushing.

Given the sheer amount of media Postbox organizes in any email account, add-ons could be an exciting possibility for Postbox, as developers write tools to make use of the images, contacts, text, and memories residing in every inbox. At the moment, though, the add-on list is limited to tweaks for minimizing to system trays, auto-reply text insertion, developer tools, and similar niche tools.

Not that these aren't a welcome addition—especially tweaks like Nostalgy, which brings in a heap of keyboard shortcuts and folder name auto-completion. But like nearly any open-source project, Postbox's extensibility and killer features will depend on the dedication and creativity of its coding community. We're eager to see what comes up.

Postbox 1.0 beta 13 is a free download for Windows and Mac systems.