about:blank pages are treated with respect to the opening page

lib/intercept.js

@@ -21,8 +21,22 @@
 		}
 	}
 	exports.setRandomSupplyByType = setRandomSupplyByType;
+	
+	function getURL(window){
+		if (window.location.href === "about:blank"){
+			if (window !== window.parent){
+				return getURL(window.parent);
+			}
+			else if (window.opener){
+				return getURL(window.opener);
+			}
+		}
+		return window.location.href;
+	}
+	
 	exports.intercept = function intercept({subject: window}, {check, checkStack, ask, notify, prefs}){
-		var siteStatus = check({url: window.location.href});
+		
+		var siteStatus = check({url: getURL(window)});
 		if (siteStatus.mode !== "allow"){
 			apiNames.forEach(function(name){
 				var changedFunction = changedFunctions[name];
@@ -37,7 +51,8 @@
 								enumerable: true,
 								configureable: false,
 								get: function(){
-									if (!window.location.href){
+									var url = getURL(window);
+									if (!url){
 										return undef;
 									}
 									var error = new Error();
@@ -56,7 +71,7 @@
 											case "fake":
 												setRandomSupplyByType(prefs("rng"));
 												var fake = changedFunction.fakeGenerator(prefs, function(messageId){
-													notify({url: window.location.href, errorStack: error.stack, messageId});
+													notify({url, errorStack: error.stack, messageId});
 												}, original);
 												switch (fake){
 													case true:

lib/randomSupplies.js

@@ -5,10 +5,21 @@
 (function(){
 	"use strict";
 	
+	function getDomain(window){
+		if (window.location.href === "about:blank"){
+			if (window !== window.parent){
+				return getDomain(window.parent);
+			}
+			else if (window.opener){
+				return getDomain(window.opener);
+			}
+		}
+		return window.location.host;
+	}
 	const persistentRnd = Object.create(null);
 	exports.persistent = {
 		getRng: function(length, window){
-			var domain = window.document.location.host;
+			var domain = getDomain(window);
 			if (!persistentRnd[domain]){
 				// create the (sub-)domains random numbers if not existing
 				persistentRnd[domain] = new Uint8Array(128);

releaseNotes.txt

@@ -10,6 +10,7 @@ Version 0.3.6:
 		- faking webGL
 		- added readPixels for webGL2
 		- removed error message when notification can not be closed
+		- about:blank pages are treated with respect to the opening page
 
 Version 0.3.5
 	new features: