--- a/mail/app/profile/all-thunderbird.js
+++ b/mail/app/profile/all-thunderbird.js
@@ -789,41 +789,8 @@ pref("intl.regional_prefs.use_os_locales
 // Multi-lingual preferences
 pref("intl.multilingual.enabled", false);
 
 // We don't support yet language pack download from ATN
 pref("intl.multilingual.downloadEnabled", false);
 
 // Dark in-content pages
 pref("browser.in-content.dark-mode", true);
-
-// Marionette is the remote protocol that lets OOP programs communicate with,
-// instrument, and control Gecko.
-
-// Starts and stops the Marionette server.
-pref("marionette.enabled", false);
-
-// Delay server startup until a modal dialogue has been clicked to allow time
-// for user to set breakpoints in the Browser Toolbox.
-pref("marionette.debugging.clicktostart", false);
-
-// Verbosity of Marionette logger repository.
-//
-// Available levels are, in descending order of severity, "trace", "debug",
-// "config", "info", "warn", "error", and "fatal". The value is treated
-// case-insensitively.
-pref("marionette.log.level", "Info");
-
-// Certain log messages that are known to be long are truncated. This
-// preference causes them to not be truncated.
-pref("marionette.log.truncate", true);
-
-// Port to start Marionette server on.
-pref("marionette.port", 2828);
-
-// Sets recommended automation preferences when Marionette is started.
-pref("marionette.prefs.recommended", true);
-
-// Whether content scripts can be safely reused.
-//
-// Deprecated and scheduled for removal with
-// https://bugzil.la/marionette-window-tracking
-pref("marionette.contentListener", false);