Log to Firefox Error Console from JavaScript

If you define a global function that checks for the existence of window.console, you can use Firebug for tracing and still plays nice with other browsers and/or if you turn Firebug’s console tracing off:

debug = function (log_txt) {
    if (typeof window.console != 'undefined') {
        console.log(log_txt);
    }
}

debug("foo!");