generate salt in browser action

src/src/browser_action/js/browser_action.js

@@ -8,6 +8,14 @@
 
   chrome.tabs.onUpdated.addListener(tabChanged.bind(this))
   chrome.tabs.onCreated.addListener(tabChanged.bind(this))
+  
+  // get or generate salt
+  var salt = JSON.parse(window.localStorage.getItem('salt') || 'null')
+  if (!salt) {
+    salt = Array.from(window.crypto.getRandomValues(new Uint8Array(256))) // 2048 bits!
+    window.localStorage.setItem('salt', JSON.stringify(salt))
+  }
+  console.log(salt)
 
   function tabChanged (tab) {
     chrome.tabs.getSelected(null, function (tab) {
@@ -56,13 +64,14 @@
   infoView()
 
   passField.addEventListener('keyup', generate.bind(this))
-  domain.addEventListener('keyup', generate.bind(this))
+  domainField.addEventListener('keyup', generate.bind(this))
 
   function generate () {
     var masterPassword = document.getElementById('master').value
     var output = document.getElementById('output')
 
     var p = new PretzelPass()
+    p.setSalt(salt)
     p.setOptions(JSON.parse(localStorage['options' + domain] || localStorage['options'] || '{}'))
 
     var generatedPassword = p.generatePassword(masterPassword, domain)