diff --git a/user.js b/user.js
index 284f934..d2917e5 100644
--- a/user.js
+++ b/user.js
@@ -699,7 +699,7 @@ user_pref("security.pki.sha1_enforcement_level", 1);
  * 2=detect Family Safety mode and import the root
  * [1] https://trac.torproject.org/projects/tor/ticket/21686 ***/
 user_pref("security.family_safety.mode", 0);
-/* 1222: disable intermediate certificate caching (fingerprinting attack vector) [RESTART]
+/* 1222: disable intermediate certificate caching (fingerprinting attack vector) [FF41+] [RESTART]
  * [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only.
  * Saved logins and passwords are not available. Reset the pref and restart to return them.
  * [1] https://shiftordie.de/blog/2017/02/21/fingerprinting-firefox-users-with-cached-intermediate-ca-certificates-fiprinca/ ***/