diff --git a/CHANGES.md b/CHANGES.md
index dc89a88e91b9..43e04b9b137b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -9,6 +9,7 @@ Change Log
 * Fixed glTF support to handle skinned meshes when no skin is supplied. [#6061](https://github.com/AnalyticalGraphicsInc/cesium/issues/6061)
 * Allow loadWithXhr to work with string URLs in a web worker.
 * Fix Firefox WebGL console warnings. [#5912](https://github.com/AnalyticalGraphicsInc/cesium/issues/5912)
+* Fix parsing Cesium.js in older browsers that do not support all TypedArray types. [#6396](https://github.com/AnalyticalGraphicsInc/cesium/pull/6396)
 
 ##### Additions :tada:
 * Improved `MapboxImageryProvider` performance by 300% via `tiles.mapbox.com` subdomain switching. [#6426](https://github.com/AnalyticalGraphicsInc/cesium/issues/6426)
diff --git a/Source/Core/FeatureDetection.js b/Source/Core/FeatureDetection.js
index 772b744ea697..1d9ee2a17224 100644
--- a/Source/Core/FeatureDetection.js
+++ b/Source/Core/FeatureDetection.js
@@ -7,6 +7,7 @@ define([
         defined,
         Fullscreen) {
     'use strict';
+    /*global CanvasPixelArray*/
 
     var theNavigator;
     if (typeof navigator !== 'undefined') {
@@ -196,6 +197,19 @@ define([
         return supportsImageRenderingPixelated() ? imageRenderingValueResult : undefined;
     }
 
+    var typedArrayTypes = [];
+    if (typeof ArrayBuffer !== 'undefined') {
+        typedArrayTypes.push(Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array);
+
+        if (typeof Uint8ClampedArray !== 'undefined') {
+            typedArrayTypes.push(Uint8ClampedArray);
+        }
+
+        if (typeof CanvasPixelArray !== 'undefined') {
+            typedArrayTypes.push(CanvasPixelArray);
+        }
+    }
+
     /**
      * A set of functions to detect whether the current browser supports
      * various features.
@@ -219,7 +233,8 @@ define([
         hardwareConcurrency : defaultValue(theNavigator.hardwareConcurrency, 3),
         supportsPointerEvents : supportsPointerEvents,
         supportsImageRenderingPixelated: supportsImageRenderingPixelated,
-        imageRenderingValue: imageRenderingValue
+        imageRenderingValue: imageRenderingValue,
+        typedArrayTypes: typedArrayTypes
     };
 
     /**
diff --git a/Source/Core/arraySlice.js b/Source/Core/arraySlice.js
index deb9aa766eeb..a8f0e03b1b9c 100644
--- a/Source/Core/arraySlice.js
+++ b/Source/Core/arraySlice.js
@@ -10,7 +10,17 @@ define([
         FeatureDetection) {
     'use strict';
 
-    var slice = function(array, begin, end) {
+     /**
+     * Create a shallow copy of an array from begin to end.
+     *
+     * @param {Array} array The array to fill.
+     * @param {Number} [begin=0] The index to start at.
+     * @param {Number} [end=array.length] The index to end at which is not included.
+     *
+     * @returns {Array} The resulting array.
+     * @private
+     */
+    function arraySlice(array, begin, end) {
         //>>includeStart('debug', pragmas.debug);
         Check.defined('array', array);
         if (defined(begin)) {
@@ -20,54 +30,22 @@ define([
             Check.typeOf.number('end', end);
         }
         //>>includeEnd('debug');
-        return array.slice(begin, end);
-    };
-
-    if (FeatureDetection.supportsTypedArrays()) {
-        var tempArray = new Uint8Array(1);
-        if (typeof tempArray.slice !== 'function') {
-            var typedArrayTypes = [Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array];
-            slice = function(array, begin, end) {
-                //>>includeStart('debug', pragmas.debug);
-                Check.defined('array', array);
-                if (defined(begin)) {
-                    Check.typeOf.number('begin', begin);
-                }
-                if (defined(end)) {
-                    Check.typeOf.number('end', end);
-                }
-                //>>includeEnd('debug');
-
-                if (typeof array.slice === 'function') {
-                    return array.slice(begin, end);
-                }
 
-                var copy = Array.prototype.slice.call(array, begin, end);
-                var length = typedArrayTypes.length;
-                for (var i = 0; i < length; ++i) {
-                    if (array instanceof typedArrayTypes[i]) {
-                        copy = new typedArrayTypes[i](copy);
-                        break;
-                    }
-                }
+        if (typeof array.slice === 'function') {
+            return array.slice(begin, end);
+        }
 
-                return copy;
-            };
+        var copy = Array.prototype.slice.call(array, begin, end);
+        var typedArrayTypes = FeatureDetection.typedArrayTypes;
+        var length = typedArrayTypes.length;
+        for (var i = 0; i < length; ++i) {
+            if (array instanceof typedArrayTypes[i]) {
+                copy = new typedArrayTypes[i](copy);
+                break;
+            }
         }
-    }
 
-    /**
-     * Create a shallow copy of an array from begin to end.
-     *
-     * @param {Array} array The array to fill.
-     * @param {Number} [begin=0] The index to start at.
-     * @param {Number} [end=array.length] The index to end at which is not included.
-     *
-     * @returns {Array} The resulting array.
-     * @private
-     */
-    function arraySlice(array, begin, end) {
-        return slice(array, begin, end);
+        return copy;
     }
 
     return arraySlice;
diff --git a/Specs/equals.js b/Specs/equals.js
index caeb2a650d39..6d47c07f9016 100644
--- a/Specs/equals.js
+++ b/Specs/equals.js
@@ -3,25 +3,9 @@ define([
     ], function(
         FeatureDetection) {
     'use strict';
-    /*global CanvasPixelArray*/
-
-    var typedArrayTypes = [];
-
-    // Earlier versions of IE do not support typed arrays
-    if (FeatureDetection.supportsTypedArrays()) {
-        typedArrayTypes.push(Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array);
-
-        if (typeof Uint8ClampedArray !== 'undefined') {
-            typedArrayTypes.push(Uint8ClampedArray);
-        }
-
-        if (typeof CanvasPixelArray !== 'undefined') {
-            typedArrayTypes.push(CanvasPixelArray);
-        }
-    }
 
     function isTypedArray(o) {
-        return typedArrayTypes.some(function(type) {
+        return FeatureDetection.typedArrayTypes.some(function(type) {
             return o instanceof type;
         });
     }