diff --git a/src/backend/cpu/function-builder.js b/src/backend/cpu/function-builder.js
index c7e53cd8..8e996ddf 100644
--- a/src/backend/cpu/function-builder.js
+++ b/src/backend/cpu/function-builder.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const FunctionBuilderBase = require('../function-builder-base');
 const CPUFunctionNode = require('./function-node');
 
diff --git a/src/backend/cpu/function-node.js b/src/backend/cpu/function-node.js
index 9e59ea1d..1a07af30 100644
--- a/src/backend/cpu/function-node.js
+++ b/src/backend/cpu/function-node.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const BaseFunctionNode = require('../function-node-base');
 
 /**
diff --git a/src/backend/cpu/kernel-string.js b/src/backend/cpu/kernel-string.js
index 71e36a30..4b1d1cb1 100644
--- a/src/backend/cpu/kernel-string.js
+++ b/src/backend/cpu/kernel-string.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../../core/utils');
 const kernelRunShortcut = require('../kernel-run-shortcut');
 
diff --git a/src/backend/cpu/kernel.js b/src/backend/cpu/kernel.js
index 21f5282f..b9d30fdb 100644
--- a/src/backend/cpu/kernel.js
+++ b/src/backend/cpu/kernel.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const KernelBase = require('../kernel-base');
 const utils = require('../../core/utils');
 const kernelString = require('./kernel-string');
diff --git a/src/backend/cpu/runner.js b/src/backend/cpu/runner.js
index 1e534250..74b74fc3 100644
--- a/src/backend/cpu/runner.js
+++ b/src/backend/cpu/runner.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../../core/utils');
 const RunnerBase = require('../runner-base');
 const CPUKernel = require('./kernel');
diff --git a/src/backend/function-builder-base.js b/src/backend/function-builder-base.js
index d4899891..a1e4200b 100644
--- a/src/backend/function-builder-base.js
+++ b/src/backend/function-builder-base.js
@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = class FunctionBuilderBase {
 
 	/**
diff --git a/src/backend/function-node-base.js b/src/backend/function-node-base.js
index cca73ff2..2c71dd01 100644
--- a/src/backend/function-node-base.js
+++ b/src/backend/function-node-base.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../core/utils');
 const parser = require('../core/parser').parser;
 
diff --git a/src/backend/kernel-base.js b/src/backend/kernel-base.js
index b259ee0b..68c3551a 100644
--- a/src/backend/kernel-base.js
+++ b/src/backend/kernel-base.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../core/utils');
 
 module.exports = class BaseKernel {
diff --git a/src/backend/kernel-run-shortcut.js b/src/backend/kernel-run-shortcut.js
index fc7b531a..a8c6ac79 100644
--- a/src/backend/kernel-run-shortcut.js
+++ b/src/backend/kernel-run-shortcut.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../core/utils');
 
 module.exports = function kernelRunShortcut(kernel) {
diff --git a/src/backend/runner-base.js b/src/backend/runner-base.js
index 4dda7fa6..06d04990 100644
--- a/src/backend/runner-base.js
+++ b/src/backend/runner-base.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../core/utils');
 const kernelRunShortcut = require('./kernel-run-shortcut');
 
diff --git a/src/backend/web-gl/function-builder.js b/src/backend/web-gl/function-builder.js
index 48b404ef..c8f49943 100644
--- a/src/backend/web-gl/function-builder.js
+++ b/src/backend/web-gl/function-builder.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const FunctionBuilderBase = require('../function-builder-base');
 const WebGLFunctionNode = require('./function-node');
 const utils = require('../../core/utils');
diff --git a/src/backend/web-gl/function-node.js b/src/backend/web-gl/function-node.js
index e1aef0d4..f872b163 100644
--- a/src/backend/web-gl/function-node.js
+++ b/src/backend/web-gl/function-node.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const FunctionNodeBase = require('../function-node-base');
 const utils = require('../../core/utils');
 // Closure capture for the ast function, prevent collision with existing AST functions
diff --git a/src/backend/web-gl/kernel-string.js b/src/backend/web-gl/kernel-string.js
index 46d8db9f..720e5cbd 100644
--- a/src/backend/web-gl/kernel-string.js
+++ b/src/backend/web-gl/kernel-string.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('../../core/utils');
 const kernelRunShortcut = require('../kernel-run-shortcut');
 
diff --git a/src/backend/web-gl/kernel.js b/src/backend/web-gl/kernel.js
index 50fdfb6b..4c606f68 100644
--- a/src/backend/web-gl/kernel.js
+++ b/src/backend/web-gl/kernel.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const fs = require('fs');
 const KernelBase = require('../kernel-base');
 const utils = require('../../core/utils');
diff --git a/src/backend/web-gl/runner.js b/src/backend/web-gl/runner.js
index 373a03c3..64b31516 100644
--- a/src/backend/web-gl/runner.js
+++ b/src/backend/web-gl/runner.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const RunnerBase = require('../runner-base');
 const WebGLKernel = require('./kernel');
 const utils = require('../../core/utils');
diff --git a/src/backend/web-gl/validator-kernel.js b/src/backend/web-gl/validator-kernel.js
index da498258..0de87df2 100644
--- a/src/backend/web-gl/validator-kernel.js
+++ b/src/backend/web-gl/validator-kernel.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const WebGLKernel = require('./kernel');
 const utils = require('../../core/utils');
 
diff --git a/src/core/alias.js b/src/core/alias.js
index c6c6b2db..39a60afb 100644
--- a/src/core/alias.js
+++ b/src/core/alias.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('./utils');
 module.exports = function alias(name, fn) {
 	const fnString = fn.toString();
diff --git a/src/core/gpu-core.js b/src/core/gpu-core.js
index a875fdcf..4cf1d56b 100644
--- a/src/core/gpu-core.js
+++ b/src/core/gpu-core.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const UtilsCore = require("./utils-core");
 
 /**
diff --git a/src/core/gpu.js b/src/core/gpu.js
index f5c8e40b..b5fe2410 100644
--- a/src/core/gpu.js
+++ b/src/core/gpu.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const utils = require('./utils');
 const WebGLRunner = require('../backend/web-gl/runner');
 const CPURunner = require('../backend/cpu/runner');
diff --git a/src/core/texture.js b/src/core/texture.js
index 467f4b9e..22eadd89 100644
--- a/src/core/texture.js
+++ b/src/core/texture.js
@@ -1,3 +1,5 @@
+'use strict';
+
 let gpu = null;
 
 module.exports = class Texture {
diff --git a/src/core/utils-core.js b/src/core/utils-core.js
index 67b25642..b6896ed3 100644
--- a/src/core/utils-core.js
+++ b/src/core/utils-core.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  *
  * @desc Reduced subset of Utils, used exclusively in gpu-core.js
@@ -216,10 +218,16 @@ class UtilsCore {
 const _isCanvasSupported = typeof document !== 'undefined' ? UtilsCore.isCanvas(document.createElement('canvas')) : false;
 const _testingWebGl = UtilsCore.initWebGl(UtilsCore.initCanvas());
 const _isWebGlSupported = UtilsCore.isWebGl(_testingWebGl);
-const _isWebGlDrawBuffersSupported = Boolean(_testingWebGl.getExtension('WEBGL_draw_buffers'));
+const _isWebGlDrawBuffersSupported = _isWebGlSupported && Boolean(_testingWebGl.getExtension('WEBGL_draw_buffers'));
 
-UtilsCore.OES_texture_float         = _testingWebGl.OES_texture_float;
-UtilsCore.OES_texture_float_linear  = _testingWebGl.OES_texture_float_linear;
-UtilsCore.OES_element_index_uint    = _testingWebGl.OES_element_index_uint;
+if (_isWebGlSupported) {
+  UtilsCore.OES_texture_float = _testingWebGl.OES_texture_float;
+  UtilsCore.OES_texture_float_linear = _testingWebGl.OES_texture_float_linear;
+  UtilsCore.OES_element_index_uint = _testingWebGl.OES_element_index_uint;
+} else {
+  UtilsCore.OES_texture_float = false;
+  UtilsCore.OES_texture_float_linear = false;
+  UtilsCore.OES_element_index_uint = false;
+}
 
 module.exports = UtilsCore;
\ No newline at end of file
diff --git a/src/core/utils.js b/src/core/utils.js
index a6ff231d..0f38e985 100644
--- a/src/core/utils.js
+++ b/src/core/utils.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * 
  * @classdesc Various utility functions / snippets of code that GPU.JS uses internally.\
diff --git a/src/index-core.js b/src/index-core.js
index ce57cf40..37d75529 100644
--- a/src/index-core.js
+++ b/src/index-core.js
@@ -1,10 +1,12 @@
+'use strict';
+
 const GPUCore = require("./core/gpu-core");
 if (typeof module !== 'undefined') {
 	module.exports = GPUCore;
 }
 if (typeof window !== 'undefined') {
 	window.GPUCore = GPUCore;
-	if(window.GPU == null) {
+	if(window.GPU === null) {
 		window.GPU = GPUCore;
 	}
 }
\ No newline at end of file
diff --git a/src/index.js b/src/index.js
index b22c9c89..c8a03bf0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const GPU = require('./core/gpu');
 const alias = require('./core/alias');
 const utils = require('./core/utils');