diff --git a/Prevent-WebRTC-from-leaking-local-IP-address.md b/Prevent-WebRTC-from-leaking-local-IP-address.md
index 8bc2ad1..8e6cb27 100644
--- a/Prevent-WebRTC-from-leaking-local-IP-address.md
+++ b/Prevent-WebRTC-from-leaking-local-IP-address.md
@@ -18,7 +18,9 @@ The feature works only on version 42 and above.
 
 ##### Firefox
 
-With Firefox, it's not possible to prevent local IP addresses leakage without completely disabling WebRTC -- this is what uBlock Origin does.
+With Firefox 41 and lower **OR** uBlock Origin 1.3.3 and lower, **it is NOT possible** to prevent local IP addresses leakage without completely disabling WebRTC.
+
+With Firefox 42 and higher **AND** uBlock Origin 1.3.4 and higher, **it is possible** to prevent local IP addresses leakage without completely disabling WebRTC.
 
 WebRTC is required for Firefox Hello to work properly. Thus Firefox Hello won't work if you enable this setting.