Download
Install · about 2 minutes

Download atbridge.ai

Two pieces: the Thunderbird add-on and the atbridge.ai core (a small command-line tool). Install both, connect them, done — on macOS, Linux, or Windows.

1

Before you start

  • Install Thunderbird on your computer. Get Thunderbird
  • Add at least one email account in Thunderbird — you'll need it to finish atbridge setup.
2

Download atbridge.ai add-on for Thunderbird

The add-on is a .xpi for Thunderbird.

atbridge.ai for Thunderbird
Thunderbird add-on · .xpi
Download the add-on

⏳ The add-on goes live at launch. Everything else on this page works now — come back for this file, or ask us for early access.

3

Install atbridge.ai add-on in Thunderbird

In Thunderbird, install the file you just downloaded — the steps below show exactly where to click.

Installing the atbridge.ai add-on in Thunderbird — step 1 of 7: Open Settings
1. Open Settings
Installing the atbridge.ai add-on in Thunderbird — step 2 of 7: Open Add-ons and Themes
2. Open Add-ons and Themes
Installing the atbridge.ai add-on in Thunderbird — step 3 of 7: Open Tools for Add-ons
3. Open Tools for Add-ons
Installing the atbridge.ai add-on in Thunderbird — step 4 of 7: Click “Install Add-on From File…”
4. Click “Install Add-on From File…”
Installing the atbridge.ai add-on in Thunderbird — step 5 of 7: Choose the .xpi file and install it
5. Choose the .xpi file and install it
Installing the atbridge.ai add-on in Thunderbird — step 6 of 7: Click Add
6. Click Add
Installing the atbridge.ai add-on in Thunderbird — step 7 of 7: Click “Install atbridge.ai core”, then follow the wizard’s instructions to finish setup
7. Click “Install atbridge.ai core”, then follow the wizard’s instructions to finish setup

Step-by-step install guides are live — pick your OS and follow along:

🍎 macOSInstall & setup guide
🪟 WindowsInstall & setup guide
🐧 LinuxInstall & setup guide
✨ Usually that's all you need. When the add-on loads, Thunderbird opens the atbridge setup wizard — follow it and it installs the core, connects your AI, and activates your plan for you, on every platform (macOS, Windows, Linux, including Snap & Flatpak). Prefer to set up by hand, or the wizard didn't finish? Use the manual steps below.
Set up by hand — Linux, Snap or Flatpak, or if the wizard didn't finish
4

Install the core

Run one command. It downloads the atbridge core for your platform (a single small executable — no dependencies), registers it with your Thunderbird profile, and hands the add-on to Thunderbird — nothing else is touched.

$ curl -fsSL https://atbridge.ai/install.sh | sh
$ curl -fsSL https://atbridge.ai/install.sh | sh
PS> irm https://atbridge.ai/install.ps1 | iex

Run in PowerShell. No admin rights needed — everything installs per-user.

Verify it worked: atbridge --version should print a version number.

5

Connect & activate

Back in your terminal (PowerShell on Windows), connect the core to Thunderbird:

$ atbridge bridge install

Then activate your plan — auto-detect walks your Thunderbird accounts and picks the right one:

$ atbridge license activate

Bought Personal or Pro? Give your Thunderbird account email at the prompt. Just trying it out? Press Enter to start the 14-day free trial.

Using Snap or Flatpak Thunderbird?

The confined app connects over the local bridge instead — run this in place of bridge install:

$ atbridge bridge service install && atbridge bridge service start

Auto-detect can't read your accounts under confinement, so activate with your license key — find it in your account:

$ atbridge license activate --email you@example.com --key <your-key>
6

Verify

$ atbridge license status --pretty

You want to see your plan, status ok, and Local storage  enabled ✓. If that last row says DISABLED, in Thunderbird open Account Settings → Synchronization & Storage, tick "Keep messages for this account on this computer", then click Download Now.