diff --git a/user.js b/user.js
index 00b27f2..75f5c6b 100644
--- a/user.js
+++ b/user.js
@@ -793,6 +793,7 @@ user_pref("_user.js.parrot", "4000 syntax error: the parrot's bereft of life!");
    1973265 - disable WebCodecs API (FF142)
    1984333 - spoof navigator.hardwareConcurrency as 4 except mac return 8 (FF143+)
        previously FF55+ it returned 2
+   1999126 - enforce navigator.pdfViewerEnabled as true and plugins/mimeTypes as hard-coded values (FF147+)
 ***/
 user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
 /* 4501: enable RFP