Merge pull request #636 from MetaMask/how-it-works-bug

How it works now displays only on install

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 - Fix bug where pending transactions from Test net (or other networks) show up In Main net.
 - Add fiat conversion values to more views.
-- On fresh install, open a new tab with the MetaMask Introduction video.
+- On fresh install, open a new tab with the MetaMask Introduction video. Does not open on update.
 - Block negative values from transactions.
 - Fixed a memory leak.
 - MetaMask logo now renders as super lightweight SVG, improving compatibility and performance.

app/scripts/background.js

@@ -37,8 +37,10 @@ function showUnconfirmedTx (txParams, txData, onTxDoneCb) {
 
 // On first install, open a window to MetaMask website to how-it-works.
 
-extension.runtime.onInstalled.addListener(function (object) {
-  extension.tabs.create({url: 'https://metamask.io/#how-it-works'})
+extension.runtime.onInstalled.addListener(function (details) {
+  if (details.reason === 'install') {
+    extension.tabs.create({url: 'https://metamask.io/#how-it-works'})
+  }
 })
 
 //