1603: add warning, fixes #332

user.js

@@ -905,7 +905,8 @@ user_pref("network.http.sendRefererHeader", 2);
 user_pref("network.http.referer.trimmingPolicy", 0);
 /* 1603: CROSS ORIGIN: control when to send a referer [SETUP]
  * 0=always (default), 1=only if base domains match, 2=only if hosts match
- * [NOTE] 1=less breakage, possible leakage 2=less leakage, more breakage ***/
+ * [NOTE] 1=less breakage, possible leakage 2=less leakage, more breakage
+ * [WARNING] Reset to default 0 if you have issues accessing your modem/router ***/
 user_pref("network.http.referer.XOriginPolicy", 1);
 /* 1604: CROSS ORIGIN: control the amount of information to send (FF52+)
  * 0=send full URI (default) 1=scheme+host+path+port 2=scheme+host+port ***/