diff --git a/_locales/de/messages.json b/_locales/de/messages.json
index 3720122..63f94e4 100644
--- a/_locales/de/messages.json
+++ b/_locales/de/messages.json
@@ -653,6 +653,14 @@
 		"message": "maximal",
 		"description": ""
 	},
+	"useAudioCache_title": {
+		"message": "Zwischenspeicher für Audio verwenden",
+		"description": ""
+	},
+	"useAudioCache_description": {
+		"message": "Aktiviert den Audio-Zwischenspeicher. Dies kann die Detektion des Addons verhindern aber reduziert die Geschwindigkeit des Addons.",
+		"description": ""
+	},
 	"audiousefixedindices_title": {
 		"message": "Feste Indizes verwenden",
 		"description": ""
diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index 5dd8edb..1fa778f 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -653,6 +653,14 @@
 		"message": "maximal",
 		"description": ""
 	},
+	"useaudiocache_title": {
+		"message": "Use audio cache",
+		"description": ""
+	},
+	"useaudiocache_description": {
+		"message": "Enables the audio cache. This can prevent detection but decreases the performance.",
+		"description": ""
+	},
 	"audiousefixedindices_title": {
 		"message": "Use fixed indices",
 		"description": ""
diff --git a/lib/hash.js b/lib/hash.js
new file mode 100644
index 0000000..058bbe8
--- /dev/null
+++ b/lib/hash.js
@@ -0,0 +1,226 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+(function(){
+	"use strict";
+	
+	var scope;
+	if ((typeof exports) !== "undefined"){
+		scope = exports;
+	}
+	else {
+		window.scope.hash = {};
+		scope = window.scope.hash;
+	}
+	scope.byteArrayToString = function byteArrayToString(byteArray){
+		return String.fromCharCode.apply(String, new Uint16Array(byteArray.buffer));
+	};
+	
+	scope.none = function(){
+		return Symbol("no hash");
+	};
+	
+	scope.sumXor = function(inputByteArray){
+		var hash = new Uint32Array(4);
+		var sum = new Float64Array(hash.buffer, 8, 1);
+		var intView = new Uint32Array(inputByteArray.buffer);
+		var floatView = new Float32Array(inputByteArray.buffer);
+		var length = intView.length;
+		for (let i = 0; i < length; i += 1){
+			// sum[0] += floatView[i];
+			hash[0] ^= intView[i];
+			hash[1] = (hash[1] >>> 7 | hash[1] << 25) ^ (intView[i] >>> 11 | intView[i] << 21);
+		}
+		return hash;
+	};
+	
+	scope.md5 = function(){
+		function leftRotate(v, rotate){
+			return v << rotate | v >>> (32 - rotate);
+		}
+		const r = new Uint8Array([
+			7, 12, 17, 22,  7, 12, 17, 22,  7, 12,
+			17, 22,  7, 12, 17, 22,  5,  9, 14, 20,
+			5,  9, 14, 20,  5,  9, 14, 20,  5,  9,
+			14, 20,  4, 11, 16, 23,  4, 11, 16, 23,
+			4, 11, 16, 23,  4, 11, 16, 23,  6, 10,
+			15, 21,  6, 10, 15, 21,  6, 10, 15, 21,
+			6, 10, 15, 21
+		]);
+		const k = new Uint32Array([
+			0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf,
+			0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af,
+			0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e,
+			0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+			0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6,
+			0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
+			0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122,
+			0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+			0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039,
+			0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, 0xf4292244, 0x432aff97,
+			0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d,
+			0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+			0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+		]);
+		const hInitial = new Uint32Array([
+			0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476
+		]);
+		const h = new Uint32Array(4);
+		const w = new Uint32Array(16);
+		const temp = new Uint32Array(6);
+		return function md5(inputByteArray){
+			h.set(hInitial);
+			
+			var length = inputByteArray.buffer.byteLength;
+			var messageBitLength = length * 8;
+			
+			// create byte array with length dividable by 64 (512 bit)
+			var neededLength = Math.ceil((length + 1 + 8) / 64) * 64;
+			var messageByteArray = new Uint8Array(neededLength);
+			messageByteArray.set(inputByteArray);
+			var view = new DataView(messageByteArray.buffer);
+			
+			// append 10...000000
+			messageByteArray[length] = 0x80;
+			// append size in 64 bit big endian
+			view.setUint32(neededLength - 4, messageBitLength, false);
+			
+			for (var i = 0; i < neededLength; i += 64){
+				var w = new Array(16);
+				for (let j = 0; j < 64; j += 4){
+					w[j / 4] = view.getUint32(j, false);
+				}
+				
+				temp.set(h);
+				for (let j = 0; j < 64; j += 1){
+					if (j < 16){
+						temp[4] = (temp[3] ^ (temp[1] & (temp[2] ^ temp[3])));
+						temp[5] = j;
+					}
+					else if (j < 32){
+						temp[4] = (temp[2] ^ (temp[3] & (temp[1] ^ temp[2])));
+						temp[5] = (5*j + 1) % 16;
+					}
+					else if (j < 48){
+						temp[4] = ((temp[1] ^ temp[2]) ^ temp[3]);
+						temp[5] = (3*j + 5) % 16;
+					}
+					else {
+						temp[4] = (temp[2] ^ (temp[1] | (~ temp[3])));
+						temp[5] = (7*j) % 16;
+					}
+					var temp_ = temp[3];
+					temp[3] = temp[2];
+					temp[2] = temp[1];
+					temp[1] = (leftRotate(temp[0] + temp[4] + k[j] + w[temp[5]], r[j]) + temp[1]);
+					temp[0] = temp_;
+				}
+				
+				for (let j = 0; j < 4; j += 1){
+					h[j] += temp[j];
+				}
+			}
+			
+			const hash = new Uint8Array(16);
+			const hashView = new DataView(hash.buffer);
+			for (let j = 0; j < 4; j += 1){
+				hashView.setUint32(j * 4, h[j], false);
+			}
+			return hash;
+		};
+	}();
+	
+	scope.sha256 = function(){
+		function rightRotate(v, rotate){
+			return v >>> rotate | v << (32 - rotate);
+		}
+		const hInitial = new Uint32Array([
+			0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+		]);
+		const h = new Uint32Array(8);
+			
+		const k = new Uint32Array([
+			0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+			0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+			0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+			0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+			0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+			0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+			0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+			0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+		]);
+		const w = new Uint32Array(64);
+		const temp = new Uint32Array(8);
+		return function sha256(inputByteArray){
+			// Algorithmus aus http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode
+			
+			h.set(hInitial);
+			
+			var length = inputByteArray.buffer.byteLength;
+			var messageBitLength = length * 8;
+			
+			// create byte array with length dividable by 64 (512 bit)
+			var neededLength = Math.ceil((length + 1 + 8) / 64) * 64;
+			var messageByteArray = new Uint8Array(neededLength);
+			messageByteArray.set(inputByteArray);
+			var view = new DataView(messageByteArray.buffer);
+			
+			// append 10...000000
+			messageByteArray[length] = 0x80;
+			// append size in 64 bit big endian
+			view.setUint32(neededLength - 4, messageBitLength, false);
+			
+			for (let i = 0; i < neededLength; i += 64){
+				for (let j = 0; j < 64; j += 4){
+					w[j / 4] = view.getUint32(i + j, false);
+				}
+				for (let j = 16; j < 64; j += 1){
+					const s0 = rightRotate(w[j-15], 7) ^ rightRotate(w[j-15], 18) ^ (w[j-15] >>> 3);
+					const s1 = rightRotate(w[j-2], 17) ^ rightRotate(w[j-2], 19) ^ (w[j-2] >>> 10);
+					w[j] = w[j-16] + s0 + w[j-7] + s1;
+				}
+				
+				temp.set(h);
+				
+				for (let j = 0; j < 64; j += 1){
+					const s0 = rightRotate(temp[0], 2) ^ rightRotate(temp[0], 13) ^ rightRotate(temp[0], 22);
+					const maj = (temp[0] & temp[1]) ^ (temp[0] & temp[2]) ^ (temp[1] & temp[2]);
+					const t2 = (s0 + maj);
+					const s1 = rightRotate(temp[4], 6) ^ rightRotate(temp[4], 11) ^ rightRotate(temp[4], 25);
+					const ch = (temp[4] & temp[5]) ^ ((~ temp[4]) & temp[6]);
+					const t1 = (temp[7] + s1 + ch + k[j] + w[j]);
+					
+					temp[7] = temp[6];
+					temp[6] = temp[5];
+					temp[5] = temp[4];
+					temp[4] = (temp[3] + t1);
+					temp[3] = temp[2];
+					temp[2] = temp[1];
+					temp[1] = temp[0];
+					temp[0] = (t1 + t2);
+				}
+				
+				for (let j = 0; j < 8; j += 1){
+					h[j] += temp[j];
+				}
+			}
+			
+			const hash = new Uint8Array(32);
+			const hashView = new DataView(hash.buffer);
+			for (let j = 0; j < 8; j += 1){
+				hashView.setUint32(j * 4, h[j], false);
+			}
+			return hash;
+		};
+	}();
+	
+	scope.sha256String = function(byteArray){
+		return scope.byteArrayToString(scope.sha256(byteArray));
+	};
+	scope.md5String = function(byteArray){
+		return scope.byteArrayToString(scope.md5(byteArray));
+	};
+	scope.sumXorString = function(byteArray){
+		return scope.byteArrayToString(scope.sumXor(byteArray));
+	};
+}());
\ No newline at end of file
diff --git a/lib/modifiedAudioAPI.js b/lib/modifiedAudioAPI.js
index 0d5f3e4..d131695 100644
--- a/lib/modifiedAudioAPI.js
+++ b/lib/modifiedAudioAPI.js
@@ -14,6 +14,7 @@
 	}
 	
 	const logging = require("./logging");
+	const {sha256String: hashing} = require("./hash");
 	const getWrapped = require("sdk/getWrapped");
 	
 	var randomSupply = null;
@@ -77,30 +78,61 @@
 		}
 	}
 	
+	const floatCache = Object.create(null);
+	const intCache = Object.create(null);
+	
 	function fakeFloat32Array(array, window, prefs){
 		if (prefs("protectAudio")){
-			var rate = getAudioFakeRate(array, prefs);
-			var noiseLevel = getAudioNoiseLevel(prefs);
-			var rng = randomSupply.getRng(rate, window);
-			forEachIndex(array, prefs, function(index, i){
-				let value;
-				if (array[index] !== 0){
-					value = array[index] * (1 + (rng(i) / 0xffffffff - 0.5) * noiseLevel);
+			let cached = false;
+			let hash;
+			if (prefs("useAudioCache")){
+				hash = hashing(array);
+				cached = floatCache[hash];
+			}
+			if (!cached){
+				var rate = getAudioFakeRate(array, prefs);
+				var noiseLevel = getAudioNoiseLevel(prefs);
+				var rng = randomSupply.getRng(rate, window);
+				forEachIndex(array, prefs, function(index, i){
+					let value;
+					if (array[index] !== 0){
+						value = array[index] * (1 + (rng(i) / 0xffffffff - 0.5) * noiseLevel);
+					}
+					else {
+						value = Number.EPSILON * (rng(i) / 0xffffffff - 0.5) * noiseLevel;
+					}
+					array[index] = value;
+				});
+				if (prefs("useAudioCache")){
+					floatCache[hash] = new window.Float32Array(array);
 				}
-				else {
-					value = Number.EPSILON * (rng(i) / 0xffffffff - 0.5) * noiseLevel;
-				}
-				array[index] = value;
-			});
+			}
+			else {
+				array.set(cached);
+			}
 		}
 	}
 	function fakeUint8Array(array, window, prefs){
 		if (prefs("protectAudio")){
-			var rate = getAudioFakeRate(array, prefs);
-			var rng = randomSupply.getValueRng(rate, window);
-			forEachIndex(prefs, function(index, i){
-				array[index] = rng(array[index], i);
-			});
+			let cached = false;
+			let hash;
+			if (prefs("useAudioCache")){
+				hash = hashing(array);
+				cached = intCache[hash];
+			}
+			if (!cached){
+				var rate = getAudioFakeRate(array, prefs);
+				var rng = randomSupply.getValueRng(rate, window);
+				forEachIndex(prefs, function(index, i){
+					array[index] = rng(array[index], i);
+				});
+				if (prefs("useAudioCache")){
+					intCache[hash] = new window.Uint8Array(array);
+				}
+			}
+			else {
+				array.set(cached);
+			}
 		}
 	}
 	
diff --git a/lib/settingDefinitions.js b/lib/settingDefinitions.js
index 622ec1d..b3b19d2 100644
--- a/lib/settingDefinitions.js
+++ b/lib/settingDefinitions.js
@@ -177,6 +177,10 @@
 			defaultValue: "minimal",
 			options: ["minimal", "low", "medium", "high", "maximal"]
 		},
+		{
+			name: "useAudioCache",
+			defaultValue: true
+		},
 		{
 			name: "audioUseFixedIndices",
 			defaultValue: true
diff --git a/manifest.json b/manifest.json
index feea14d..8be512e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -31,6 +31,7 @@
 			
 			"lib/colorStatistics.js",
 			"lib/webgl.js",
+			"lib/hash.js",
 			"lib/modifiedAudioAPI.js",
 			"lib/modifiedAPI.js",
 			"lib/randomSupplies.js",
diff --git a/options/settingsDisplay.js b/options/settingsDisplay.js
index 4e5ebf4..588d28f 100644
--- a/options/settingsDisplay.js
+++ b/options/settingsDisplay.js
@@ -328,6 +328,22 @@
 				}
 			]
 		},
+		{
+			"name": "useAudioCache",
+			"displayDependencies": [
+				{
+					"blockMode": ["fakeReadout", "fakeInput"],
+					"protectAudio": [true],
+					"displayAdvancedSettings": [true]
+				},
+				{
+					"blockMode": ["askReadout", "ask", "allow"],
+					"askDenyMode": ["fake"],
+					"protectAudio": [true],
+					"displayAdvancedSettings": [true]
+				}
+			]
+		},
 		{
 			"name": "audioUseFixedIndices",
 			"displayDependencies": [