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 ### Preferences
 Set and lock preferences.
 
 ### Preferences
 Set and lock preferences.
 

+**NOTE** On Windows, in order to use this policy, you must clear all settings in the old **Preferences (Deprecated)** section.
+

 Previously you could only set and lock a subset of preferences. Starting with Firefox 81 and Firefox ESR 78.3 you can set many more preferences. You can also set default preferences, user preferences and you can clear preferences.
 
 Preferences that start with the following prefixes are supported:
 Previously you could only set and lock a subset of preferences. Starting with Firefox 81 and Firefox ESR 78.3 you can set many more preferences. You can also set default preferences, user preferences and you can clear preferences.
 
 Preferences that start with the following prefixes are supported: