diff --git a/AllowIcon.png b/AllowIcon.png
new file mode 100644
index 0000000..dec1c1d
Binary files /dev/null and b/AllowIcon.png differ
diff --git a/AskIcon.png b/AskIcon.png
new file mode 100644
index 0000000..c929448
Binary files /dev/null and b/AskIcon.png differ
diff --git a/data/inject.js b/data/inject.js
index 0c4cd8b..8056e68 100644
--- a/data/inject.js
+++ b/data/inject.js
@@ -16,6 +16,7 @@ function block(force){
 		unsafeWindow.HTMLCanvasElement.prototype.getContext = null;
 	}
 }
+
 function ask(force){
 	if (force || !checkPDF("ask")){
 		// console.log("ask");
@@ -28,23 +29,69 @@ function ask(force){
 				enumerabe: false
 			}
 		);
-		unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(function(){
-			var oldBorder = this.style.border;
-			this.style.border = "2px dashed red";
-			var confirmText =
-				this.parentNode?
-				"Do you want to allow the red bordered <canvas>?":
-				"Do you want to allow an invisibe <canvas>?";
-			var allow = confirm(confirmText);
-			this.style.border = oldBorder;
-			if (allow){
-				this.getContext = this["askFunctionName"];
-				return this["askFunctionName"].apply(this, arguments);
+		unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(
+			function(){
+				if (this.parentNode){
+					var oldBorder = this.style.border;
+					this.style.border = "2px dashed red";
+					var confirmText = "askForPermission";
+					var allow = confirm(confirmText);
+					this.style.border = oldBorder;
+					if (allow){
+						this.getContext = this["askFunctionName"];
+						return this["askFunctionName"].apply(this, arguments);
+					}
+					else {
+						this.getContext = null;
+						return null;
+					}
+				}
+				else {
+					return null;
+				}
+			}.toString()
+				.replace(/^function\s*\(\)\s*\{|\}\s*$/g, "")
+				.replace(/askFunctionName/g, askFunctionName)
+				.replace(/askForPermission/g, _("askForPermission"))
+		);
+	}
+}
+function askInvisible(force){
+	if (force || !checkPDF("askInvisible")){
+		// console.log("ask");
+		
+		Object.defineProperty(
+			unsafeWindow.HTMLCanvasElement.prototype,
+			askFunctionName,
+			{
+				value: getContext,
+				enumerabe: false
 			}
-			else {
-				return null;
-			}
-		}.toString().replace(/^function\s*\(\)\s*\{|\}\s*$/g, "").replace(/askFunctionName/g, askFunctionName));
+		);
+		unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(
+			function(){
+				var oldBorder = this.style.border;
+				this.style.border = "2px dashed red";
+				var confirmText =
+					this.parentNode?
+					"askForPermission":
+					"askForInvisiblePermission";
+				var allow = confirm(confirmText);
+				this.style.border = oldBorder;
+				if (allow){
+					this.getContext = this["askFunctionName"];
+					return this["askFunctionName"].apply(this, arguments);
+				}
+				else {
+					this.getContext = null;
+					return null;
+				}
+			}.toString()
+				.replace(/^function\s*\(\)\s*\{|\}\s*$/g, "")
+				.replace(/askFunctionName/g, askFunctionName)
+				.replace(/askForPermission/g, _("askForPermission"))
+				.replace(/askForInvisiblePermission/g, _("askForInvisiblePermission"))
+		);
 	}
 }
 function unblock(){
@@ -52,8 +99,16 @@ function unblock(){
 	unsafeWindow.HTMLCanvasElement.prototype.getContext = getContext;
 }
 
-ask();
+var _ = function(name){
+	return _[name] || name;
+}
+self.port.on("setTranslation", function(name, translation){
+	_[name] = translation;
+});
+
+block();
 self.port.on("block", block);
 self.port.on("ask", ask);
+self.port.on("askInvisible", askInvisible);
 self.port.on("unblock", unblock);
 self.port.on("detach", unblock);
\ No newline at end of file
diff --git a/lib/main.js b/lib/main.js
index 2f2b1cb..a946fe5 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -34,7 +34,9 @@ var pageMod = require("sdk/page-mod");
 var preferences = require("sdk/simple-prefs");
 var prefs = preferences.prefs;
 var {URL} = require("sdk/url");
+var _ = require("sdk/l10n").get;
 
+// preferences
 var whiteList;
 function updateWhiteList(){
 	whiteList = getDomainRegExpList(prefs.whiteList);
@@ -55,6 +57,7 @@ preferences.on("blackList", function(){
 	workers.forEach(checkWorker);
 });
 
+
 var workers = [];
 function detachWorker(worker, workerArray) {
 	var index = workerArray.indexOf(worker);
@@ -83,7 +86,12 @@ function checkWorker(worker){
 			}
 			else {
 				if (prefs.askPermission){
-					worker.port.emit("ask");
+					if (prefs.askInvisiblePermission){
+						worker.port.emit("askInvisible");
+					}
+					else {
+						worker.port.emit("ask");
+					}
 				}
 				else {
 					worker.port.emit("block");
@@ -96,6 +104,7 @@ function checkWorker(worker){
 preferences.on("blockAll", function(){
 	if (prefs.blockAll){
 		prefs.askPermission = false;
+		prefs.askInsiviblePermission = false;
 	}
 	workers.forEach(checkWorker);
 });
@@ -103,6 +112,16 @@ preferences.on("askPermission", function(){
 	if (prefs.askPermission){
 		prefs.blockAll = false;
 	}
+	else {
+		prefs.askInvisiblePermission = false;
+	}
+	workers.forEach(checkWorker);
+});
+preferences.on("askInvisiblePermission", function(){
+	if (prefs.askInvisiblePermission){
+		prefs.askPermission = true;
+		prefs.blockAll = false;
+	}
 	workers.forEach(checkWorker);
 });
 preferences.on("allowPDFCanvas", function(){
@@ -115,12 +134,14 @@ pageMod.PageMod({
 	contentScriptWhen: "start",
 	contentScriptFile: self.data.url("inject.js"),
 	onAttach: function(worker){
-		checkWorker(worker);
 		
 		workers.push(worker);
 		worker.on("detach", function(){
 			detachWorker(this, workers);
 		});
+		worker.port.on("getTranslation", function(name){
+			worker.port.emit("setTranslation", name, _.apply(null, arguments));
+		});
 		worker.port.on("isPDF", function(blocking){
 			if (prefs.allowPDFCanvas){
 				worker.port.emit("unblock");
@@ -129,5 +150,8 @@ pageMod.PageMod({
 				worker.port.emit(blocking, true);
 			}
 		});
+		worker.port.emit("setTranslation", "askForPermission", _("askForPermission"));
+		worker.port.emit("setTranslation", "askForInvisiblePermission", _("askForInvisiblePermission"));
+		checkWorker(worker);
 	},
 });
\ No newline at end of file
diff --git a/locale/de-DE.properties b/locale/de-DE.properties
new file mode 100644
index 0000000..377dacb
--- /dev/null
+++ b/locale/de-DE.properties
@@ -0,0 +1,20 @@
+whilteList_title= Whitelist
+whiteList_description= Domänen oder URLs, die die <canvas>-API verwenden dürfen. Mehrere Einträge müssen durch ein Komma getrennt weren.
+
+blockAll_title= Alles blockieren
+blockAll_description= Ob immer alles blockiert werden soll (ignoriert die Whitelist).
+
+blackList_title= Blacklist
+blackList_description= Domänen oder URLs, die die <canvas>-API niemals verwenden dürfen. Mehrere Einträge müssen durch ein Komma getrennt weren.
+
+askPermission_title= Um Erlaubnis fragen
+askPermission_description= Ob man gefragt werden soll, ob ein sichtbares <canvas>-Element blockiert werden soll oder nicht, wenn die Domäne oder URL weder auf der Whitelist noch auf der Blacklist steht.
+
+askInvisiblePermission_title= Bei verstecken Elementen um Erlaubnis fragen
+askInvisiblePermission_description= Ob man gefragt werden soll, ob ein verstecktes <canvas>-Element blockiert werden soll oder nicht, wenn die Domäne oder URL weder auf der Whitelist noch auf der Blacklist steht.
+
+allowPDFCanvas_title= <canvas> in PDFs erlauben
+allowPDFCanvas_description= Die native pdf.js verwendet <canvas> um den Inhalt von PDFs anzuzeigen. Wenn dies nicht markiert ist, werden viele Nachfragedialoge erscheinen oder die PDF Ansicht nicht funktionieren.
+
+askForPermission= Wollen Sie das rot umrandete <canvas> erlauben?
+askForInvisiblePermission= Wollen Sie ein verstecktes <canvas> erlauben?
\ No newline at end of file
diff --git a/locale/en-US.properties b/locale/en-US.properties
new file mode 100644
index 0000000..c876eb0
--- /dev/null
+++ b/locale/en-US.properties
@@ -0,0 +1,20 @@
+whilteList_title= White list
+whiteList_description= Domains or URLs where the <canvas>-API should not be blocked. To add multiple entries seperate them by comma.
+
+blockAll_title= Block everything
+blockAll_description= If you want to block everything (ignore the white list).
+
+blackList_title= Black list
+blackList_description= Domains or URLs where the <canvas>-API should always be blocked. To add multiple entries seperate them by comma.
+
+askPermission_title= Ask for permission
+askPermission_description= If you want to be asked if you want to block a visible canvas element if the domain or URL is neither in the white or black list.
+
+askInvisiblePermission_title= Ask for permission for invisible elements
+askInvisiblePermission_description= If you want to be asked if you want to block an invisible canvas element if the domain or URL is neither in the white or black list.
+
+allowPDFCanvas_title= Allow canvas in PDFs
+allowPDFCanvas_description= The native pdf.js uses <canvas> to display the PDF content. If this is unchecked there will lots of annoying ask dialogs or the PDF display will not work.
+
+askForPermission= Do you want to allow the red bordered <canvas>?
+askForInvisiblePermission= Do you want to allow an invisibe <canvas>?
\ No newline at end of file
diff --git a/package.json b/package.json
index 4066943..bab5f49 100644
--- a/package.json
+++ b/package.json
@@ -7,41 +7,42 @@
 		{
 			"name": "whiteList",
 			"title": "White list",
-			"description": "Domains where the <canvas>-API should not be blocked. To add multiple domains seperate them by comma.",
 			"type": "string",
 			"value": "kkapsner.de,^https?://(\\\\w+\\\\.)*google.[a-z]+/maps"
 		},
 		{
 			"name": "blockAll",
 			"title": "Block everything",
-			"description": "If you want to block everything (ignore the white list).",
 			"type": "bool",
 			"value": false
 		},
 		{
 			"name": "blackList",
 			"title": "Black list",
-			"description": "Domains where the <canvas>-API should always be blocked. To add multiple domains seperate them by comma.",
 			"type": "string",
 			"value": ""
 		},
 		{
 			"name": "askPermission",
 			"title": "Ask for permission",
-			"description": "If you want to be asked if you want to block a canvas element if the domain is neither in the white or black list.",
 			"type": "bool",
 			"value": true
 		},
+		{
+			"name": "askInvisiblePermission",
+			"title": "Ask for permission for invisible elements",
+			"type": "bool",
+			"value": false
+		},
 		{
 			"name": "allowPDFCanvas",
-			"title": "Allow canvas in PDFs.",
-			"description": "The native pdf.js uses <canvas> to display the PDF content. If this is unchecked there will lots of annoying ask dialogs.",
+			"title": "Allow canvas in PDFs",
 			"type": "bool",
 			"value": true
 		}
 	],
 	"author": "Korbinian Kapsner",
 	"license": "MPL 2.0",
-	"version": "0.1.2",
+	"version": "0.1.3",
 	"permissions": {"private-browsing": true}
 }