diff --git a/user_manual/pim/sync_thunderbird.rst b/user_manual/pim/sync_thunderbird.rst
index a3d659fd0..8d3ea408b 100644
--- a/user_manual/pim/sync_thunderbird.rst
+++ b/user_manual/pim/sync_thunderbird.rst
@@ -11,23 +11,23 @@ Recommended method
 For this method, you need to have three add-ons installed:
 
 1. The `Lightning calendar <https://addons.thunderbird.net/en/thunderbird/addon/lightning/>`_ (Only needed for Thunderbird versions up to 68).
-2. `TBSync <https://addons.thunderbird.net/en/thunderbird/addon/tbsync/>`_.
-3. The `TBSync provider for CalDAV and CardDAV <https://addons.thunderbird.net/en/thunderbird/addon/dav-4-tbsync/>`_.
+2. `TbSync <https://addons.thunderbird.net/en/thunderbird/addon/tbsync/>`_.
+3. The `TbSync provider for CalDAV and CardDAV <https://addons.thunderbird.net/en/thunderbird/addon/dav-4-tbsync/>`_.
 
-When they are installed, if you are on Windows, go to **Extras**/**Synchronisation settings (TBSync)** or **Edit/Synchronisation settings (TBSync)** if on Linux, and then:
+When they are installed, if you are on Windows, go to **Extras**/**Synchronisation settings (TbSync)** or **Edit/Synchronisation settings (TbSync)** if on Linux, and then:
 
 * In the account manager choose "**Add account** / **CalDAV / CardDAV account**"
 * In the next window, go with the default called **Automatic configuration** and click **next**
 * Enter an **account name**, which you can freely choose, **user name**, **password** and the **URL of your server** and click **next**
-* In the next window, TBSync should have autodiscovered the CalDAV and CardDAV addresses. When it has, click **Finish**
-* Now check the box **Enable and synchronize this account**. TBSync will discover all address books and calenders your account has access to on the server
+* In the next window, TbSync should have autodiscovered the CalDAV and CardDAV addresses. When it has, click **Finish**
+* Now check the box **Enable and synchronize this account**. TbSync will discover all address books and calenders your account has access to on the server
 * Check the box next to each calender and address book you want to have synchronised, also set how often you want them to be synchronised and push the button **sychronize now**
-* After the first successful synchronisation is complete, you can close the window. Henceforth, TBSync will do the work for you. You are done and can skip the next sections (unless you need a more advanced address book)
+* After the first successful synchronisation is complete, you can close the window. Henceforth, TbSync will do the work for you. You are done and can skip the next sections (unless you need a more advanced address book)
 
 
 Alternative: Using the CardBook add-on (Contacts only)
 ------------------------------------------------------
-`CardBook <https://addons.thunderbird.net/en/thunderbird/addon/cardbook/>`_ is an advanced alternative to Thunderbird's address book, which supports CardDAV. You can have TBSync and CardBook installed in parallel.
+`CardBook <https://addons.thunderbird.net/en/thunderbird/addon/cardbook/>`_ is an advanced alternative to Thunderbird's address book, which supports CardDAV. You can have TbSync and CardBook installed in parallel.
  
 1. Click the CardBook icon in the upper right corner of Thunderbird:
 
@@ -52,7 +52,7 @@ The old method: Manually subscribing to calendars
 -------------------------------------------------
 This method is only needed if you don't want to install TBSync.
 
-1. Go to your Nextcloud Calendar and click on the 3 dotted menu for the calendar that you want to synchronize which will display and URL that looks something like this:
+1. Go to your Nextcloud Calendar and click on the 3 dotted menu for the calendar that you want to synchronize which will display an URL that looks something like this:
 
    ``https://cloud.nextcloud.com/remote.php/dav/calendars/daniel/personal/``