Postbox 6.0 Support - SpamSieve - C-Command Software Forum
Sep 21, 2020 · Postbox is based on Mozilla code, and as of Firefox Quantum, XUL-based add-ons have been removed from the Mozilla platform. Since future versions of Postbox will no longer have the ability to run add-ons, we’ve discontinued support for them in Postbox 6. Add-ons developed by Postbox, Inc. have been added to Postbox 6, including Signatures, Responses, and our Cloud File Sharing.
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