diff --git a/src/background/key-queue.js b/src/background/key-queue.js
index e14e995..cd8d865 100644
--- a/src/background/key-queue.js
+++ b/src/background/key-queue.js
@@ -17,10 +17,18 @@ export default class KeyQueue {
 
   push(key) {
     this.data.push(key);
-    for (let map of DEFAULT_KEYMAP) {
-      if (keys.keysEquals(map.keys, this.data)) {
+    let filtered = DEFAULT_KEYMAP.filter((map) => {
+      return keys.hasPrefix(map.keys, this.data)
+    });
+
+    if (filtered.length == 0) {
+      this.data = [];
+      return;
+    } else if (filtered.length == 1) {
+      let map = filtered[0];
+      if (map.keys.length == this.data.length) {
         this.data = [];
-        return map.action
+        return map.action;
       }
     }
     return null;
diff --git a/src/background/keys.js b/src/background/keys.js
index d6a94fb..802340d 100644
--- a/src/background/keys.js
+++ b/src/background/keys.js
@@ -1,4 +1,4 @@
-const keyEquals = (key1, key2) => {
+const identifyKey = (key1, key2) => {
   return (key1.code === key2.code) &&
     ((key1.shift || false) === (key2.shift || false)) &&
     ((key1.ctrl || false) === (key2.ctrl || false)) &&
@@ -6,16 +6,23 @@ const keyEquals = (key1, key2) => {
     ((key1.meta || false) === (key2.meta || false));
 };
 
-const keysEquals = (keys1, keys2) => {
-  if (keys1.length !== keys2.length) {
+const hasPrefix = (keys, prefix) => {
+  if (keys.length < prefix.length) {
     return false;
   }
-  for (let i = 0; i < keys1.length; ++i) {
-    if (!keyEquals(keys1[i], keys2[i])) {
+  for (let i = 0; i < keys.length; ++i) {
+    if (!identifyKey(keys[i], prefix[i])) {
       return false;
     }
   }
   return true;
 }
 
-export { keyEquals, keysEquals };
+const identifyKeys = (keys1, keys2) => {
+  if (keys1.length !== keys2.length) {
+    return false;
+  }
+  return hasPrefix(keys1, keys2);
+}
+
+export { identifyKey, identifyKeys, hasPrefix };