diff --git a/test/settingsLoading.php b/test/settingsLoading.php
index 23c07b1..de32117 100644
--- a/test/settingsLoading.php
+++ b/test/settingsLoading.php
@@ -3,17 +3,71 @@
 <head>
 	<title>Test</title>
 	<script>
+		console.log("starting first fingerprint");
+		function fingerPrint(){
+			"use strict";var canvas = document.createElement("canvas");
+			canvas.setAttribute("width", 220);
+			canvas.setAttribute("height", 30);
+			
+			var fp_text = "BrowserLeaks,com <canvas> 10";
+			
+			var ctx = canvas.getContext("2d");
+			ctx.textBaseline = "top";
+			ctx.font = "14px 'Arial'";
+			ctx.textBaseline = "alphabetic";
+			ctx.fillStyle = "#f60";
+			ctx.fillRect(125, 1, 62, 20);
+			ctx.fillStyle = "#069";
+			ctx.fillText(fp_text, 2, 15);
+			ctx.fillStyle = "rgba(102, 204, 0, 07)";
+			ctx.fillText(fp_text, 4, 17);
+			
+			return canvas.toDataURL();
+		}
+		function hash(url){
+			var buffer = new TextEncoder("utf-8").encode(url);
+			return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
+				var chunks = [];
+				(new Uint32Array(hash)).forEach(function(num){
+					chunks.push(num.toString(16));
+				});
+				return chunks.map(function(chunk){
+					return "0".repeat(8 - chunk.length) + chunk;
+				}).join("");
+			});
+		}
 		try {
-			var c = document.createElement("canvas").getContext("2d");
+			var firstFingerprint = fingerPrint();
 		}
 		catch (e){
-			console.log(e);
-			var c = false;
+			console.log(new Date(), e);
+			var firstFingerprint = false;
 		}
 	</script>
 </head>
 <body>
 	<script>
-		document.body.textContent = c? "context API not blocked": "context API blocked";
+		if (firstFingerprint){
+			document.body.textContent = "context API not blocked";
+			window.setTimeout(function(){
+				console.log("starting second fingerprint");
+				document.body.appendChild(document.createElement("br"));
+				secondFingerprint = fingerPrint();
+				if (firstFingerprint === secondFingerprint){
+					hash(firstFingerprint).then(function(hash){
+						document.body.appendChild(document.createTextNode("fingerprint consistent (" + firstFingerprint + ") -> good!"));
+					});
+				}
+				else {
+					Promise.all([hash(firstFingerprint), hash(secondFingerprint)]).then(function(hashes){
+						document.body.appendChild(document.createTextNode("fingerprint not consistent (" + hashes[0] + " != " + hashes[1] + ") -> very bad! (potential fingerprint leak)"));
+						document.body.style.backgroundColor = "red";
+					});
+				}
+			}, 500);
+		}
+		else {
+			document.body.textContent = "context API blocked";
+		}
 	</script>
 </body></html>
\ No newline at end of file
