Bug 947569 - Increase timeout for browser_net_accessibility-01.js, r=me

browser/devtools/netmonitor/test/browser_net_accessibility-01.js

@@ -9,6 +9,9 @@ function test() {
   initNetMonitor(CUSTOM_GET_URL).then(([aTab, aDebuggee, aMonitor]) => {
     info("Starting test... ");
 
+    // It seems that this test may be slow on Ubuntu builds running on ec2.
+    requestLongerTimeout(2);
+
     let { NetMonitorView } = aMonitor.panelWin;
     let { RequestsMenu } = NetMonitorView;