diff --git a/app/scripts/config.js b/app/scripts/config.js
new file mode 100644
index 000000000..f26e6778d
--- /dev/null
+++ b/app/scripts/config.js
@@ -0,0 +1,12 @@
+const MAINET_RPC_URL = 'https://mainnet.infura.io/'
+const TESTNET_RPC_URL = 'https://morden.infura.io/'
+const DEFAULT_RPC_URL = TESTNET_RPC_URL
+
+module.exports = {
+  network: {
+    default: DEFAULT_RPC_URL,
+    mainnet: MAINET_RPC_URL,
+    testnet: TESTNET_RPC_URL,
+  },
+}
+
diff --git a/app/scripts/inpage.js b/app/scripts/inpage.js
index 33e2c9358..91d782a32 100644
--- a/app/scripts/inpage.js
+++ b/app/scripts/inpage.js
@@ -4,6 +4,7 @@ const StreamProvider = require('./lib/stream-provider.js')
 const LocalMessageDuplexStream = require('./lib/local-message-stream.js')
 const setupMultiplex = require('./lib/stream-utils.js').setupMultiplex
 const RemoteStore = require('./lib/remote-store.js').RemoteStore
+const MetamaskConfig = require('./config.js')
 const Web3 = require('web3')
 const once = require('once')
 restoreContextAfterImports()
@@ -12,8 +13,6 @@ restoreContextAfterImports()
 delete window.Web3
 window.MetamaskWeb3 = Web3
 
-const DEFAULT_RPC_URL = 'https://rpc.metamask.io/'
-
 
 //
 // setup plugin communication
@@ -93,15 +92,33 @@ publicConfigStore.subscribe(function(state){
 })
 
 // setup sync http provider
-var providerConfig = publicConfigStore.get('provider') || {}
-var providerUrl = providerConfig.rpcTarget ? providerConfig.rpcTarget : DEFAULT_RPC_URL
-var syncProvider = new Web3.providers.HttpProvider(providerUrl)
-publicConfigStore.subscribe(function(state){
-  if (!state.provider) return
-  if (!state.provider.rpcTarget || state.provider.rpcTarget === providerUrl) return
-  providerUrl = state.provider.rpcTarget
-  syncProvider = new Web3.providers.HttpProvider(providerUrl)
-})
+updateProvider({ provider: publicConfigStore.get('provider') })
+publicConfigStore.subscribe(updateProvider)
+
+var syncProvider = null
+var syncProviderUrl = null
+
+function updateProvider(state){
+  var providerConfig = state.provider || {}
+  var newSyncProviderUrl = undefined
+
+  if (providerConfig.rpcTarget) {
+    newSyncProviderUrl = providerConfig.rpcTarget
+  } else {
+    switch(providerConfig.type) {
+      case 'testnet':
+        newSyncProviderUrl = MetamaskConfig.network.testnet
+        break
+      case 'mainnet':
+        newSyncProviderUrl = MetamaskConfig.network.mainnet
+        break
+      default:
+        newSyncProviderUrl = MetamaskConfig.network.default
+    }
+  }
+  if (newSyncProviderUrl === syncProviderUrl) return
+  syncProvider = new Web3.providers.HttpProvider(newSyncProviderUrl)
+}
 
 // handle sync methods
 remoteProvider.send = function(payload){
diff --git a/app/scripts/lib/config-manager.js b/app/scripts/lib/config-manager.js
index 3c9326db9..847d85a20 100644
--- a/app/scripts/lib/config-manager.js
+++ b/app/scripts/lib/config-manager.js
@@ -1,11 +1,12 @@
 const Migrator = require('pojo-migrator')
 const extend = require('xtend')
+const MetamaskConfig = require('./config.js')
+const migrations = require('./migrations')
 
 const STORAGE_KEY = 'metamask-config'
-const TESTNET_RPC = 'https://morden.infura.io'
-const MAINNET_RPC = 'https://mainnet.infura.io/'
+const TESTNET_RPC = MetamaskConfig.network.testnet
+const MAINNET_RPC = MetamaskConfig.network.mainnet
 
-const migrations = require('./migrations')
 
 /* The config-manager is a convenience object
  * wrapping a pojo-migrator.