diff --git a/canvasblocker.xpi b/canvasblocker.xpi
index 655f687..f9759d4 100644
Binary files a/canvasblocker.xpi and b/canvasblocker.xpi differ
diff --git a/data/inject.js b/data/inject.js
index 057dca9..d5867e5 100644
--- a/data/inject.js
+++ b/data/inject.js
@@ -241,6 +241,10 @@
 	
 	// Communication with main.js
 	
+	function checkAbout(){
+		return document.location.protocol === "about:");
+	}
+	
 	function checkPDF(blocking){
 		if (document.contentType.match(/\/pdf$/i)){
 			self.port.emit("isPDF", blocking);
@@ -250,32 +254,32 @@
 	}
 	
 	self.port.on("block", function(force){
-		if (force || !checkPDF("block")){
+		if (force || !checkAbout() || !checkPDF("block")){
 			blockMode.getContext.status = "block";
 			blockMode.readAPI.status = "allow";
 		}
 	});
 	self.port.on("ask", function(force, askOnce){
-		if (force || !checkPDF("askVisible")){
+		if (force || !checkAbout() || !checkPDF("askVisible")){
 			blockMode.getContext.status = "ask";
 			blockMode.getContext.askStatus.askOnce = askOnce;
 			blockMode.readAPI.status = "allow";
 		}
 	});
 	self.port.on("blockReadout", function(force){
-		if (force || !checkPDF("blockReadout")){
+		if (force || !checkAbout() || !checkPDF("blockReadout")){
 			blockMode.getContext.status = "allow";
 			blockMode.readAPI.status = "block";
 		}
 	});
 	self.port.on("fakeReadout", function(force){
-		if (force || !checkPDF("fakeReadout")){
+		if (force || !checkAbout() || !checkPDF("fakeReadout")){
 			blockMode.getContext.status = "allow";
 			blockMode.readAPI.status = "fake";
 		}
 	});
 	self.port.on("askReadout", function(force, askOnce){
-		if (force || !checkPDF("askReadout")){
+		if (force || !checkAbout() || !checkPDF("askReadout")){
 			blockMode.getContext.status = "allow";
 			blockMode.readAPI.status = "ask";
 			blockMode.readAPI.askStatus.askOnce = askOnce;