diff -Naur firefox-52.9.0esr.orig/intl/lwbrk/nsJISx4051LineBreaker.cpp firefox-52.9.0esr/intl/lwbrk/nsJISx4051LineBreaker.cpp
--- firefox-52.9.0esr.orig/intl/lwbrk/nsJISx4051LineBreaker.cpp	2024-01-07 16:54:44.911690681 +0100
+++ firefox-52.9.0esr/intl/lwbrk/nsJISx4051LineBreaker.cpp	2024-01-07 17:18:28.544628736 +0100
@@ -550,7 +550,12 @@
     /* REGIONAL_INDICATOR = 39,           [RI] */ CLASS_CHARACTER,
     /* E_BASE = 40,                       [EB] */ CLASS_BREAKABLE,
     /* E_MODIFIER = 41,                   [EM] */ CLASS_CHARACTER,
-    /* ZWJ = 42,                          [ZWJ]*/ CLASS_CHARACTER
+    /* ZWJ = 42,                          [ZWJ]*/ CLASS_CHARACTER,
+    /* AKSARA = 43,                       [AK] */ CLASS_CHARACTER,
+    /* AKSARA_PREBASE = 44,               [AP] */ CLASS_CHARACTER,
+    /* AKSARA_START = 45,                 [AS] */ CLASS_CHARACTER,
+    /* VIRAMA_FINAL = 46,                 [VF] */ CLASS_CHARACTER,
+    /* VIRAMA = 47,                       [VI] */ CLASS_CHARACTER
   };
 
 #if ENABLE_INTL_API