diff --git a/backup/fileSaveLoad.js b/backup/fileSaveLoad.js
index 8cf123c9..a2a971bd 100644
--- a/backup/fileSaveLoad.js
+++ b/backup/fileSaveLoad.js
@@ -1,14 +1,20 @@
-var STYLISH_DUMP_FILE_EXT     = ".txt";
-var STYLISH_DEFAULT_SAVE_NAME = "stylus-mm-dd-yyy" + STYLISH_DUMP_FILE_EXT;
+'use strict';
 
-function saveAsFile(text, fileName, dialog) {
-    fileName = fileName || STYLISH_DEFAULT_SAVE_NAME;
-    dialog = typeof dialog === "boolean" ? dialog : true;
+var STYLISH_DUMP_FILE_EXT     = '.txt';
+var STYLISH_DEFAULT_SAVE_NAME = 'stylus-mm-dd-yyy' + STYLISH_DUMP_FILE_EXT;
 
-    return new Promise(function(resolve){
-        var fileContent = 'data:text/plain;charset=utf-8,' + encodeURIComponent(text);
-        chrome.downloads.download({filename: fileName, saveAs: true, url: fileContent}, resolve)
-    });
+function saveAsFile (text, fileName, dialog) {
+  fileName = fileName || STYLISH_DEFAULT_SAVE_NAME;
+  dialog = typeof dialog === 'boolean' ? dialog : true;
+
+  return new Promise(function (resolve) {
+    var fileContent = 'data:text/plain;charset=utf-8,' + encodeURIComponent(text);
+    chrome.downloads.download({
+      filename: fileName,
+      saveAs: true,
+      url: fileContent
+    }, resolve);
+  });
 }
 
 /**
@@ -19,28 +25,28 @@ function saveAsFile(text, fileName, dialog) {
  * gets it's path,
  * gets content of it by ajax
  */
-function loadFromFile(formatToFilter){
-    return new Promise(function(resolve){
-        var fileInput = document.createElement('input');
-        fileInput.style = "display: none;";
-        fileInput.type = "file";
-        fileInput.accept = formatToFilter || STYLISH_DUMP_FILE_EXT;
-        fileInput.acceptCharset = "utf8";
+function loadFromFile (formatToFilter) {
+  return new Promise(function (resolve) {
+    var fileInput = document.createElement('input');
+    fileInput.style = 'display: none;';
+    fileInput.type = 'file';
+    fileInput.accept = formatToFilter || STYLISH_DUMP_FILE_EXT;
+    fileInput.acceptCharset = 'utf-8';
 
-        document.body.appendChild(fileInput);
-        fileInput.initialValue = fileInput.value;
-        fileInput.addEventListener('change', changeHandler);
-        function changeHandler(){
-            if (fileInput.value !== fileInput.initialValue){
-                var fReader = new FileReader();
-                fReader.onloadend = function (event){
-                    fileInput.removeEventListener('change', changeHandler);
-                    fileInput.remove();
-                    resolve(event.target.result);
-                };
-                fReader.readAsText(fileInput.files[0], 'utf-8')
-            }
-        }
-        fileInput.click();
-    });
+    document.body.appendChild(fileInput);
+    fileInput.initialValue = fileInput.value;
+    function changeHandler() {
+      if (fileInput.value !== fileInput.initialValue) {
+        var fReader = new FileReader();
+        fReader.onloadend = function (event) {
+          fileInput.removeEventListener('change', changeHandler);
+          fileInput.remove();
+          resolve(event.target.result);
+        };
+        fReader.readAsText(fileInput.files[0], 'utf-8');
+      }
+    }
+    fileInput.addEventListener('change', changeHandler);
+    fileInput.click();
+  });
 }