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Features

• Automatically attaches files from the original email when replying.
• Configurable behavior: attachments can be
  • added automatically, or
  • added only after confirmation (a small, accessible dialog). In Options you can enable the confirmation and choose the default answer (Yes/No).
• Blacklist of filenames (glob patterns) prevents specific files from being attached automatically. Examples: *intern*, *secret*, *passwor*. Matching is case‑insensitive and checks the filename only; provide one pattern per line in Options.
• Blacklist warning (optional, enabled by default): when files are excluded by your blacklist, a small modal lists the file and the matching pattern(s). Dark‑mode friendly and keyboard accessible (Enter/Esc to close).
• Works with Reply and Reply all. Forward is not modified by this add-on.
• Adds originals even if you already attached something yourself; avoids duplicates by filename.
• Per‑tab duplicate guard prevents double‑adding in the same compose tab.
• Skips S/MIME certificates and inline images to avoid unnecessary attachments.

How It Works

• On reply, the add-on lists original attachments.
• Filters out S/MIME signatures and inline images.
• Optionally asks for confirmation (keyboard-friendly).
• Adds eligible files to your compose, avoiding duplicates by filename.
• See “Why attachments might not be added” in Usage for edge cases.

Privacy note: All processing happens locally in Thunderbird. The add-on makes no background network requests.