diff --git a/chrome/content_scripts/aHandler.js b/chrome/content_scripts/aHandler.js
new file mode 100644
index 0000000..7ebea23
--- /dev/null
+++ b/chrome/content_scripts/aHandler.js
@@ -0,0 +1,47 @@
+/* TODO:
+ * FASTER check whitelisted URL
+ */
+
+(() => {
+    const aHandler = (node) => {
+	const config = {subtree: false, childList: false, attributes: true};
+
+	const setTarget = (node) => {
+	    if (node.href.indexOf(window.location.href) !== 0)
+		node.target = "_blank";
+
+	    node.target = "_blank";
+
+	    /* disabled for performance reason */
+	    // browser.runtime.sendMessage({msg: "isWhitelisted", url: node.href})
+	    // 	.then((response) => {
+	    // 	    if (response.result === false)
+	    // 		node.target = "_blank";
+	    // 	})
+	    // 	.catch (() => node.target = "_blank");
+	};
+
+	const mutHandler = (mutations, observer) => {
+	    const a = mutations[0].target;
+	    observer.disconnect();
+	    setTarget(a);
+	    observer.observe(a, config);
+	};
+
+	setTarget(node);
+	(new MutationObserver(mutHandler)).observe(node, config);
+    };
+
+    const anchors = Array.from(document.getElementsByTagName("a"));
+    anchors.forEach((a) => aHandler(a));
+
+    const documentObserver = new MutationObserver((mutations) => {
+	mutations.forEach((m) => {
+	    const nodes = Array.from(m.addedNodes);
+	    nodes.forEach((n) => {
+		if (n.nodeName === "A")
+		    aHandler(n);
+	    });
+	});
+    });
+})();
diff --git a/chrome/manifest.json b/chrome/manifest.json
index 9a15a5e..a613941 100644
--- a/chrome/manifest.json
+++ b/chrome/manifest.json
@@ -36,6 +36,15 @@
 	]
     },
     
+    "content_scripts": [{
+	"js": [
+//	    "webextension-browser-proxy/polyfill.js",
+	    "content_scripts/aHandler.js"
+	],
+	"matches": ["<all_urls>"],
+	"run_at": "document_end"
+    }],
+
     "permissions": [
 	"contextMenus",
 	"storage",
diff --git a/common/backgrounds/qur.js b/common/backgrounds/qur.js
index 0f558cb..be128dc 100644
--- a/common/backgrounds/qur.js
+++ b/common/backgrounds/qur.js
@@ -4,11 +4,13 @@ const qur = { };
 
 /* init script */
 (async () => {
+    /* pupulate qur namespace */
     qur.whitelist = await whitelist();
     qur.settings = await settings();
     qur.native = native;
     qur.anti_rdr = anti_rdr();
 
+    /* listeners */
     browser.webRequest.onBeforeRequest.addListener(
 	redirector().route,
 	{
@@ -18,10 +20,16 @@ const qur = { };
 	["blocking"]
     );
 
+    /* disabled because used only by chrome/content_scripts/aHandler.js */
+    // browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
+    // 	if (request.msg === "isWhitelisted")
+    // 	    sendResponse({result: qur.whitelist.test(anti_rdr.escape(request.url), false)});
+    // });
+
+    /* ui stuffs */
     ui.init();
 
     /* callable by getBackgroundPage() */
     getQur = () => qur;
     
 })();
-
diff --git a/common/backgrounds/whitelist.js b/common/backgrounds/whitelist.js
index fff69f0..ddf4494 100644
--- a/common/backgrounds/whitelist.js
+++ b/common/backgrounds/whitelist.js
@@ -67,11 +67,13 @@ const whitelist = async () => {
 	    }
 	},
 
-	test: (regex) => {
-	    const tmpIndex = getIndex(regex, tmpBuffer);
-	    if (tmpIndex !== -1) {
-		tmpBuffer.splice(tmpIndex, 1);
-		return true;
+	test: (regex, checkTmp = true) => {
+	    if (checkTmp === true) {
+		const tmpIndex = getIndex(regex, tmpBuffer);
+		if (tmpIndex !== -1) {
+		    tmpBuffer.splice(tmpIndex, 1);
+		    return true;
+		}
 	    }
 
 	    return buffer.some((e) => {