diff --git a/omega-target-chromium-extension/src/module/chrome_api.coffee b/omega-target-chromium-extension/src/module/chrome_api.coffee
index 9fe35f5d..68e819f2 100644
--- a/omega-target-chromium-extension/src/module/chrome_api.coffee
+++ b/omega-target-chromium-extension/src/module/chrome_api.coffee
@@ -1,9 +1,9 @@
 OmegaTarget = require('omega-target')
 Promise = OmegaTarget.Promise
 
-chromeApiPromisifer = (originalMethod) ->
+exports.chromeApiPromisify = (target, method) ->
   return (args...) ->
-    new Promise (resolve, reject) =>
+    new Promise (resolve, reject) ->
       callback = (callbackArgs...) ->
         if chrome.runtime.lastError?
           error = new Error(chrome.runtime.lastError.message)
@@ -15,7 +15,4 @@ chromeApiPromisifer = (originalMethod) ->
           resolve(callbackArgs)
 
       args.push(callback)
-      originalMethod.apply(this, args)
-
-module.exports = (obj) ->
-  Promise.promisifyAll(Object.create(obj), {promisifier: chromeApiPromisifer})
+      target[method].apply(target, args)
diff --git a/omega-target-chromium-extension/src/module/options.coffee b/omega-target-chromium-extension/src/module/options.coffee
index 23d652e7..ba3dd4d7 100644
--- a/omega-target-chromium-extension/src/module/options.coffee
+++ b/omega-target-chromium-extension/src/module/options.coffee
@@ -2,9 +2,12 @@ OcontextMenu_inspectElementmegaTarget = require('omega-target')
 OmegaPac = OmegaTarget.OmegaPac
 Promise = OmegaTarget.Promise
 querystring = require('querystring')
-chromeApiPromisifyAll = require('./chrome_api')
+chromeApiPromisify = require('./chrome_api').chromeApiPromisify
 if chrome?.proxy?.settings
-  proxySettings = chromeApiPromisifyAll(chrome.proxy.settings)
+  proxySettings =
+    clearAsync: chromeApiPromisify(chrome.proxy.settings, 'clear')
+    setAsync: chromeApiPromisify(chrome.proxy.settings, 'set')
+    get: chrome.proxy.settings.get.bind(chrome.proxy.settings)
 else
   proxySettings =
     setAsync: -> Promise.resolve()
@@ -139,7 +142,7 @@ class ChromeOptions extends OmegaTarget.Options
     meta ?= profile
     if profile.profileType == 'SystemProfile'
       # Clear proxy settings, returning proxy control to Chromium.
-      return proxySettings.clearAsync({}).then =>
+      return chromeApiPromisify(chrome.proxy.settings, 'clear')({}).then =>
         proxySettings.get {}, @_proxyChangeListener
         return
     config = {}
diff --git a/omega-target-chromium-extension/src/module/storage.coffee b/omega-target-chromium-extension/src/module/storage.coffee
index 08384912..381e415c 100644
--- a/omega-target-chromium-extension/src/module/storage.coffee
+++ b/omega-target-chromium-extension/src/module/storage.coffee
@@ -1,4 +1,4 @@
-chromeApiPromisifyAll = require('./chrome_api')
+chromeApiPromisify = require('./chrome_api').chromeApiPromisify
 OmegaTarget = require('omega-target')
 Promise = OmegaTarget.Promise
 
@@ -39,12 +39,11 @@ class ChromeStorage extends OmegaTarget.Storage
     if browser?.storage?[@areaName]
       @storage = browser.storage[@areaName]
     else
-      wrapper = chromeApiPromisifyAll(chrome.storage[@areaName])
       @storage =
-        get: wrapper.getAsync.bind(wrapper),
-        set: wrapper.setAsync.bind(wrapper),
-        remove: wrapper.removeAsync.bind(wrapper),
-        clear: wrapper.clearAsync.bind(wrapper),
+        get: chromeApiPromisify(chrome.storage[@areaName], 'get')
+        set: chromeApiPromisify(chrome.storage[@areaName], 'set')
+        remove: chromeApiPromisify(chrome.storage[@areaName], 'remove')
+        clear: chromeApiPromisify(chrome.storage[@areaName], 'clear')
 
   get: (keys) ->
     keys ?= null