Google Analytics _gaq.push not working in Firefox

Question

I've a very basic tracking event tied to my login button that's working correctly in Chrome and IE but not in Firefox (v26)

_gaq.push(['_trackEvent', 'Navigation', 'Log In', 'Log In button']);

When a user clicks the login button, their request is authenticated via an Ajax call to the server, if the server responds with a success message, then the this GA code is triggered.

No error is reported to the console.

Is there a way to find out if the code fired correctly? Or to know if _gaq has initialised correctly?

Answer 1

Use the Google Analytics built-in hitCallback function:

So, on success:

_gaq.push(['_set', 'hitCallback' , function(){
 //default action
}]);

_gaq.push(['_trackEvent', 'Navigation', 'Log In', 'Log In button']);

Answer 2

Thanks to @Boaz I introduced a delay (50ms) after the GA code fires.

_gaq.push(['_trackEvent', 'Navigation', 'Log In', 'Log In button']);

var timeout = 1;
if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1)
    timeout = 50;

setTimeout(function() {
    //redirect
}, timeout);

Event then fired correctly