The Thunderbird Addon page
Like the Firefox Browser, Mozilla's E-Mail Client Thunderbird offers the possibility to install extensions (Add-ons). To have a certain folder open on startup, we need to have the Add-on "Manually sort folders". This is on the official Addon page of Thunderbird. This will take you directly from Thunderbird there:
- Click in the menu bar of Thunderbird, click on "tools".
- In the opened sub-menu select "Addons".
- In the newly opened window, click on the left of the page to "add-ons"(see picture point 1).
- In the middle of the opened page you now read the Text "What addon are?". You click on "learn More" (see image item 2).
- You are now on the Thunderbird Addon page.

Thunderbird Addon page
The Thunderbird Addon search and install
After you have called the add-on page, it goes on and on:
- Enter the top right in the search Manually sort folders is a panel, and start the search by clicking next to the search bar on the green arrow or simply press the Enter key.
- The first result of the search should already be the right Addon. Click on the entry and then click the green bar labeled "add To Thunderbird"(see image).
- Shortly thereafter, a small window that informs you on the Installation of the Add-ons appears. Wait a short while and then click "install Now".
- You may be prompted to restart Thunderbird new. Follow this prompt. The Add-on is now installed.

Thunderbird Addon install
The folder-settings in the Addon to make
Click now to the beginning of the description above, in the Thunderbird menu bar, go to tools/Addons. Then you need to do the following:
- Now click in the left sidebar on the entry for "extensions" under the "Addons search"button.
- The newly installed Add-on "Manually sort folders" should be listed. Click on "settings".
- In the new window, select the "Advanced" tab (see picture point 1).
- Click on the arrow behind the first box and choose use instead of "Last opened folder" is now "users use custom folder" (see image item 2).
- Now you can select the check box next to any folder to open at startup of Thunderbird (see image item 3).

Own Start folder select
Numerous other practical tips to Thunderbird you will find here.
