--- a/security/sandbox/mac/SandboxPolicies.h
+++ b/security/sandbox/mac/SandboxPolicies.h
@@ -329,16 +329,20 @@ static const char contentSandboxRules[] 
            #"\.[tT][tT][fF]$"           ; ttf
            #"\.[tT][tT][cC]$"           ; ttc
            #"\.[oO][tT][cC]$"           ; otc
            #"\.[dD][fF][oO][nN][tT]$")) ; dfont
 
   ; bug 1404919
   ; Read access (recursively) within directories ending in .fontvault
   (allow file-read* (regex #"\.fontvault/"))
+
+  ; bug 1429133
+  ; Read access to the default FontExplorer font directory
+  (allow file-read* (home-subpath "/FontExplorer X/Font Library"))
 )";
 
 static const char fileContentProcessAddend[] = R"(
   ; This process has blanket file read privileges
   (allow file-read*)
 
   ; File content processes need access to iconservices to draw file icons in
   ; directory listings