diff --git a/extension/eventPage.js b/extension/eventPage.js
index af575e1..dd196af 100644
--- a/extension/eventPage.js
+++ b/extension/eventPage.js
@@ -1,25 +1,27 @@
+/* global chrome */
+'use strict'
 
-function fetch(url, cb, type) {
-	if (url.indexOf('//') === 0) {
-		url = 'http:'+url
-	}
-	let x = new XMLHttpRequest()
-	x.open('get', url, true)
-	if (type) {
-		x.responseType = type
-	}
-	x.onload = function () {
-		console.log(x.getResponseHeader('content-type'))
-		cb(URL.createObjectURL(x.response), x.getResponseHeader('content-type'))
-	}
-	x.onerror = function () {
-		console.error('error')
-		cb(null)
-	}
-	x.send()
+function fetch (url, cb, type) {
+  if (url.indexOf('//') === 0) {
+    url = 'http:' + url
+  }
+  let x = new XMLHttpRequest()
+  x.open('get', url, true)
+  if (type) {
+    x.responseType = type
+  }
+  x.onload = function () {
+    console.log(x.getResponseHeader('content-type'))
+    cb(URL.createObjectURL(x.response), x.getResponseHeader('content-type'))
+  }
+  x.onerror = function () {
+    console.error('error')
+    cb(null)
+  }
+  x.send()
 }
 
-chrome.extension.onMessage.addListener(function(request, sender, sendResponse) {
-	fetch(request, sendResponse, 'blob')
-	return true
+chrome.extension.onMessage.addListener(function (request, sender, sendResponse) {
+  fetch(request, sendResponse, 'blob')
+  return true
 })
diff --git a/gulpfile.babel.js b/gulpfile.babel.js
index b7b6d0e..13a9d54 100644
--- a/gulpfile.babel.js
+++ b/gulpfile.babel.js
@@ -7,6 +7,7 @@ import del from 'del'
 import Sequence from 'run-sequence'
 import watch from 'gulp-watch'
 import lazypipe from 'lazypipe'
+import filter from 'gulp-filter'
 
 // script
 import standard from 'gulp-standard'
@@ -61,10 +62,9 @@ function webpackTask (callback) {
 }
 
 let lintPipe = lazypipe()
+  .pipe(filter, ['**/*', '!extension/fimfic2epub.js', '!extension/tidy.js'])
   .pipe(standard)
-    .pipe(standard.reporter, 'default', {
-      breakOnError: false
-    })
+  .pipe(standard.reporter, 'default', { breakOnError: false })
 
 // Cleanup task
 gulp.task('clean', () => del('extension/fimfic2epub.js'))
@@ -79,7 +79,7 @@ gulp.task('watch:script', () => {
 })
 
 gulp.task('lint', () => {
-  return gulp.src(['gulpfile.babel.js', 'webpack.config.babel.js', 'src/**/*.js']).pipe(lintPipe())
+  return gulp.src(['gulpfile.babel.js', 'webpack.config.babel.js', 'src/**/*.js', 'extension/**/*.js']).pipe(lintPipe())
 })
 gulp.task('watch:lint', () => {
   return watch(['src/**/*.js'], watchOpts, function (file) {
diff --git a/package.json b/package.json
index 88b4f1a..4da215a 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "babel-preset-node6": "^11.0.0",
     "del": "^2.2.0",
     "gulp": "^3.9.1",
+    "gulp-filter": "^4.0.0",
     "gulp-standard": "^7.0.1",
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.8",