Remove isInBrowser method and use environment-type.js

app/scripts/platforms/extension.js

@@ -22,22 +22,6 @@ class ExtensionPlatform {
     this.openWindow({ url: extensionURL })
   }
 
-  isInBrowser () {
-    return new Promise((resolve, reject) => {
-      try {
-        extension.tabs.getCurrent(currentTab => {
-          if (currentTab) {
-            resolve(true)
-          } else {
-            resolve(false)
-          }
-        })
-      } catch (e) {
-        reject(e)
-      }
-    })
-  }
-
   getPlatformInfo (cb) {
     try {
       extension.runtime.getPlatformInfo((platform) => {

ui/app/unlock.js

@@ -6,6 +6,7 @@ const actions = require('./actions')
 const getCaretCoordinates = require('textarea-caret')
 const EventEmitter = require('events').EventEmitter
 const { OLD_UI_NETWORK_TYPE } = require('../../app/scripts/config').enums
+const environmentType = require('../../app/scripts/lib/environment-type')
 
 const Mascot = require('./components/mascot')
 
@@ -77,12 +78,9 @@ UnlockScreen.prototype.render = function () {
         h('p.pointer', {
           onClick: () => {
             this.props.dispatch(actions.markPasswordForgotten())
-            global.platform.isInBrowser()
-              .then((isInBrowser) => {
-                if (!isInBrowser) {
-                  global.platform.openExtensionInBrowser()
-                }
-              })
+            if (environmentType() === 'popup') {
+              global.platform.openExtensionInBrowser()
+            }
           },
           style: {
             fontSize: '0.8em',