diff --git a/canvasblocker.xpi b/canvasblocker.xpi
index 4ae3092..89fdeb5 100644
Binary files a/canvasblocker.xpi and b/canvasblocker.xpi differ
diff --git a/lib/modifiedAPI.js b/lib/modifiedAPI.js
index 23be3d3..3e424bd 100644
--- a/lib/modifiedAPI.js
+++ b/lib/modifiedAPI.js
@@ -13,7 +13,11 @@
 			source = imageData.data;
 		}
 		else {
-			context = window.HTMLCanvasElement.prototype.getContext.call(original, "webgl");
+			context = 
+				window.HTMLCanvasElement.prototype.getContext.call(original, "webgl") ||
+				window.HTMLCanvasElement.prototype.getContext.call(original, "experimental-webgl") ||
+				window.HTMLCanvasElement.prototype.getContext.call(original, "webgl2") ||
+				window.HTMLCanvasElement.prototype.getContext.call(original, "experimental-webgl2");
 			imageData = new window.wrappedJSObject.ImageData(original.width, original.height);
 			source = new window.wrappedJSObject.Uint8Array(imageData.data.length);
 			window.WebGLRenderingContext.prototype.readPixels.call(