Thunderbird Mail for Claude

This tool lets Claude use your Thunderbird email, contacts, and calendar. Everything stays on your computer. Nothing goes to the cloud.

This is the MebwayCompany version of thunderbird-mcp, after a security audit. It does not update by itself. You update it by hand from this repository.

What you need

• Thunderbird (installed and open)

• Claude Desktop

Related MCP server: Thunderbird MCP

Get the two install files

Download them directly — no git, no npm, nothing to unzip:

• ⬇ Thunderbird add-on (thunderbird-mcp.xpi)

• ⬇ Claude Desktop extension (thunderbird-mcp.mcpb)

Both links always give you the newest version and download straight to your computer.

Sparse-checkout just the dist folder (~700 KB instead of the full repo):

git clone --depth 1 --filter=blob:none --sparse https://github.com/MebwayCompany/mcp-thunderbird.git
cd mcp-thunderbird
git sparse-checkout set dist

Install (two steps)

1. Thunderbird add-on. Thunderbird → Tools > Add-ons and Themes → gear icon ⚙ > Install Add-on From File… → choose the thunderbird-mcp.xpi you downloaded → restart Thunderbird.

2. Claude Desktop extension. Claude Desktop → Settings > Extensions > Install extension → choose the thunderbird-mcp.mcpb you downloaded.

Start a new chat. Claude can now use your Thunderbird mail.

When you use it

Keep Thunderbird open while you work. If Claude says it has no connection: open Thunderbird first, wait a few seconds, then start a new chat.

Already have the old manual version? (a folder + a line in a config file)

Remove it first, then install the easy way above:

1. Delete the old config line. Open %APPDATA%\Claude\claude_desktop_config.json, find "mcpServers", and delete the whole "thunderbird-mail" block. Save.

2. Remove the old add-on. Thunderbird → Tools > Add-ons and Themes → Thunderbird MCP → Remove.

3. Delete the old folder (for example C:\Users\<name>\thunderbird-mcp).

4. Fully quit Claude Desktop — window and the tray icon (bottom-right) — then reopen.

Build the files yourself (optional, needs a full clone)

git clone https://github.com/MebwayCompany/mcp-thunderbird.git
cd mcp-thunderbird
node scripts/build-xpi.cjs     # makes dist/thunderbird-mcp.xpi
node scripts/build-mcpb.cjs    # makes dist/thunderbird-mcp.mcpb

License

MIT. The bundled httpd.sys.mjs is from Mozilla and licensed under MPL-2.0.