diff --git a/ext/fg/frame.html b/ext/fg/frame.html
index e0b9eac5..3fe42eb2 100644
--- a/ext/fg/frame.html
+++ b/ext/fg/frame.html
@@ -32,6 +32,7 @@
 
         <script src="/fg/js/api.js"></script>
         <script src="/fg/js/dictionary.js"></script>
+        <script src="/fg/js/util.js"></script>
         <script src="/mixed/js/audio.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/mixed/lib/jquery.min.js"></script>
diff --git a/ext/fg/js/api.js b/ext/fg/js/api.js
index e252637e..b4d75c3c 100644
--- a/ext/fg/js/api.js
+++ b/ext/fg/js/api.js
@@ -17,47 +17,30 @@
  */
 
 
-function apiInvoke(action, params={}) {
-    return new Promise((resolve, reject) => {
-        try {
-            chrome.runtime.sendMessage({action, params}, ({result, error}) => {
-                if (error) {
-                    reject(error);
-                } else {
-                    resolve(result);
-                }
-            });
-        } catch (e) {
-            window.yomichanOrphaned = true;
-            reject(e.message);
-        }
-    });
-}
-
 function apiOptionsGet() {
-    return apiInvoke('optionsGet');
+    return utilInvoke('optionsGet');
 }
 
 function apiTermsFind(text) {
-    return apiInvoke('termsFind', {text});
+    return utilInvoke('termsFind', {text});
 }
 
 function apiKanjiFind(text) {
-    return apiInvoke('kanjiFind', {text});
+    return utilInvoke('kanjiFind', {text});
 }
 
 function apiTemplateRender(template, data) {
-    return apiInvoke('templateRender', {data, template});
+    return utilInvoke('templateRender', {data, template});
 }
 
 function apiDefinitionsAddable(definitions, modes) {
-    return apiInvoke('definitionsAddable', {definitions, modes}).catch(() => null);
+    return utilInvoke('definitionsAddable', {definitions, modes}).catch(() => null);
 }
 
 function apiDefinitionAdd(definition, mode) {
-    return apiInvoke('definitionAdd', {definition, mode});
+    return utilInvoke('definitionAdd', {definition, mode});
 }
 
 function apiNoteView(noteId) {
-    return apiInvoke('noteView', {noteId});
+    return utilInvoke('noteView', {noteId});
 }
diff --git a/ext/fg/js/util.js b/ext/fg/js/util.js
new file mode 100644
index 00000000..311fc065
--- /dev/null
+++ b/ext/fg/js/util.js
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+function utilInvoke(action, params={}) {
+    return new Promise((resolve, reject) => {
+        try {
+            chrome.runtime.sendMessage({action, params}, ({result, error}) => {
+                if (error) {
+                    reject(error);
+                } else {
+                    resolve(result);
+                }
+            });
+        } catch (e) {
+            window.yomichanOrphaned = true;
+            reject(e.message);
+        }
+    });
+}
diff --git a/ext/manifest.json b/ext/manifest.json
index 288976f3..48308b17 100644
--- a/ext/manifest.json
+++ b/ext/manifest.json
@@ -15,11 +15,13 @@
     "content_scripts": [{
         "matches": ["http://*/*", "https://*/*", "file://*/*"],
         "js": [
-            "fg/js/document.js",
-            "fg/js/source-range.js",
-            "fg/js/source-element.js",
             "fg/js/api.js",
+            "fg/js/document.js",
             "fg/js/popup.js",
+            "fg/js/source-element.js",
+            "fg/js/source-range.js",
+            "fg/js/util.js",
+
             "fg/js/frontend.js"
         ],
         "css": ["fg/css/client.css"]