Download and run the installer for your platform. If Thunderbird is not installed, the installer can download and install the official Mozilla Thunderbird build. It will then configure Thunderbird to install the TabMail add-on for all users and set up the required native full-text search helper.

macOS

Intel & Apple Silicon

Download .pkg

Windows

Windows 10 & 11

Download .exe

For users who already have Thunderbird installed or prefer manual control over the installation process.

Step 1: Install the Add-on (XPI)

Download the Thunderbird add-on and install it manually into your existing Thunderbird installation.

tabmail-latest.xpi

Download the XPI file above
Open Thunderbird
Go to Tools → Add-ons and Themes (or press Ctrl/Cmd + Shift + A)
Click the gear icon ⚙️ and select "Install Add-on From File..."
Select the downloaded XPI file

Step 2: Install Full-Text Search Helper (Required)

The native helper enables hybrid semantic search across all your emails—combining keyword matching with AI-powered understanding to find exactly what you need. No admin/sudo required — installs to your user folder.

curl -fsSL https://cdn.tabmail.ai/releases/native-fts/install.sh | bash

Open Terminal
Run the command above (no sudo needed)
Restart Thunderbird

irm https://cdn.tabmail.ai/releases/native-fts/install.ps1 | iex

Open PowerShell (no admin needed)
Run the command above
Restart Thunderbird

System Requirements

Thunderbird: Version 140.0 or later
macOS: macOS 11 (Big Sur) or later (Intel & Apple Silicon)
Windows: Windows 10 (64-bit) or later
RAM: 4GB minimum, 8GB recommended
Storage: 200MB for Thunderbird + space for your emails and search index