diff --git a/app/index.js b/app/index.js
index 86c6a386..e58e3fcd 100644
--- a/app/index.js
+++ b/app/index.js
@@ -1,7 +1,6 @@
 const { app, BrowserWindow, shell, Menu } = require('electron');
 const createRPC = require('./rpc');
 const createMenu = require('./menu');
-const Session = require('./session');
 const genUid = require('uid2');
 const { resolve } = require('path');
 const isDev = require('electron-is-dev');
@@ -12,6 +11,7 @@ const toHex = require('convert-css-color-name-to-hex');
 const config = require('./config');
 config.init();
 const plugins = require('./plugins');
+const Session = require('./session');
 
 const windowSet = new Set([]);
 
diff --git a/app/plugins.js b/app/plugins.js
index 38a85e63..4804b723 100644
--- a/app/plugins.js
+++ b/app/plugins.js
@@ -16,6 +16,13 @@ const cache = new Config();
 // modules path
 const path = resolve(homedir(), '.hyperterm_plugins');
 const localPath = resolve(homedir(), '.hyperterm_plugins', 'local');
+const availableExtensions = new Set([
+  'onApp', 'onWindow', 'onUnload', 'middleware',
+  'reduceUI', 'reduceSessions', 'decorateMenu',
+  'decorateTerm', 'decorateHyperTerm', 'decorateTab',
+  'decorateNotification', 'decorateNotifications',
+  'decorateTabs', 'decorateConfig', 'decorateEnv'
+]);
 
 // init plugin directories if not present
 mkdirpSync(path);
@@ -239,14 +246,8 @@ function requirePlugins () {
     let mod;
     try {
       mod = require(path);
-
-      if (!mod || (!mod.onApp && !mod.onWindow && !mod.onUnload &&
-        !mod.middleware && !mod.reduceUI && !mod.reduceSessions &&
-        !mod.decorateConfig && !mod.decorateMenu &&
-        !mod.decorateTerm && !mod.decorateHyperTerm &&
-        !mod.decorateTab && !mod.decorateNotification &&
-        !mod.decorateNotifications && !mod.decorateTabs &&
-        !mod.decorateConfig)) {
+      const exposed = mod && Object.keys(mod).some(key => availableExtensions.has(key));
+      if (!exposed) {
         notify('Plugin error!', `Plugin "${basename(path)}" does not expose any ` +
           'HyperTerm extension API methods');
         return;
@@ -282,48 +283,37 @@ exports.onWindow = function (win) {
   });
 };
 
-exports.decorateMenu = function (tpl) {
-  let decorated = tpl;
+// decorates the base object by calling plugin[key]
+// for all the available plugins
+function decorateObject (base, key) {
+  let decorated = base;
   modules.forEach((plugin) => {
-    if (plugin.decorateMenu) {
-      const res = plugin.decorateMenu(decorated);
-      if (res) {
+    if (plugin[key]) {
+      const res = plugin[key](decorated);
+      if (res && 'object' === typeof res) {
         decorated = res;
       } else {
-        console.error('incompatible response type for `decorateMenu`');
+        notify('Plugin error!', `"${plugin._name}": invalid return type for \`${key}\``);
       }
     }
   });
+
   return decorated;
+}
+
+exports.decorateMenu = function (tpl) {
+  return decorateObject(tpl, 'decorateMenu');
+};
+
+exports.getDecoratedEnv = function (baseEnv) {
+  return decorateObject(baseEnv, 'decorateEnv');
 };
 
 exports.getDecoratedConfig = function () {
-  let decorated = config.getConfig();
-  modules.forEach((plugin) => {
-    if (plugin.decorateConfig) {
-      const res = plugin.decorateConfig(decorated);
-      if (res && 'object' === typeof res) {
-        decorated = res;
-      } else {
-        notify('Plugin error!', `"${plugin._name}": invalid return type for \`decorateConfig\``);
-      }
-    }
-  });
-  return decorated;
+  const baseConfig = config.getConfig();
+  return decorateObject(baseConfig, 'decorateConfig');
 };
 
 exports.getDecoratedBrowserOptions = function (defaults) {
-  let decorated = defaults;
-  modules.forEach((plugin) => {
-    if (plugin.decorateBrowserOptions) {
-      const res = plugin.decorateBrowserOptions(decorated);
-      if (res && 'object' === typeof res) {
-        decorated = res;
-      } else {
-        notify('Plugin error!', `"${plugin._name}": invalid return type for \`decorateBrowserOptions\``);
-      }
-    }
-  });
-  return decorated;
+  return decorateObject(defaults, 'decorateBrowserOptions');
 };
-
diff --git a/app/session.js b/app/session.js
index c7ee468e..cdc27a62 100644
--- a/app/session.js
+++ b/app/session.js
@@ -2,6 +2,7 @@ const { app } = require('electron');
 const { EventEmitter } = require('events');
 const { exec } = require('child_process');
 const defaultShell = require('default-shell');
+const { getDecoratedEnv } = require('./plugins');
 const { productName, version } = require('./package');
 
 let spawn;
@@ -22,16 +23,18 @@ module.exports = class Session extends EventEmitter {
 
   constructor ({ rows, cols: columns, cwd, shell }) {
     super();
+    const baseEnv = Object.assign({}, process.env, {
+      LANG: app.getLocale().replace('-', '_'),
+      TERM: 'xterm-256color',
+      TERM_PROGRAM: productName,
+      TERM_PROGRAM_VERSION: version
+    });
+
     this.pty = spawn(shell || defaultShell, ['--login'], {
       columns,
       rows,
       cwd,
-      env: Object.assign({}, process.env, {
-        LANG: app.getLocale(),
-        TERM: 'xterm-256color',
-        TERM_PROGRAM: productName,
-        TERM_PROGRAM_VERSION: version
-      })
+      env: getDecoratedEnv(baseEnv)
     });
 
     this.pty.stdout.on('data', (data) => {