Thunderbird Guides

Trusting Your Root CA

Ensure you have already trusted your Root CA.
In the Thunderbird hamburger menu, click Settings.
Using the search bar, enter config, then select Config Editor....
Using the new search bar, search for security.enterprise_roots.enabled, and set the value to true.

Ensure you have already configured Linux for Tor.
You need a Proxy Auto Config file to inform Firefox how to resolve .onion URLs. You can get Start9's standard file from a terminal, by using the following command:
```
wget -P ~/ https://start9.com/assets/proxy.pac
```
Determine the full path of proxy.pac, which we will use later, by executing the following command in the terminal, and copying its output to your clipboard:
```
echo file://$HOME/proxy.pac
```
In the Thunderbird hamburger menu, click Settings.
Using the search bar, enter proxy, then select Settings....
Select Automatic proxy configuration URL, then paste the path copied from above. Be aware, the triple /// is intentional, and your path will be different from the one below - namely, YOUR_LINUX_USERNAME will be your actual linux username:
```
file:///home/YOUR_LINUX_USERNAME/proxy.pac
```

Ensure you have already configured Windows for Tor.
You need a Proxy Auto Config file to inform Firefox how to resolve .onion URLs. Click here to get the one offered by Start9. Save it somewhere you will not delete it, and remember where you save it. For example:
```
C:\Program Files\Tor Browser\proxy.pac
```
In the Thunderbird hamburger menu, click Settings.
Using the search bar, enter proxy, then select Settings....
Select the box Automatic proxy configuration URL, then paste in the path to your PAC file from earlier, prefixed with file:// and with all backslashes (\) replaced by forward slashes (/). For example:
```
file://C:/Program Files/Tor Browser/proxy.pac
```