Provide a tiny module that will allow for safe logging to console for browsers that allow it. For those that don't, don't log anything. Easily turned off with a debug switch which can be server generated (depending on environment dev/staging/prod) or no

safe_logger.js

var L = window.SafeLogger = window.SafeLogger || {};
//
// from server or on a specific page you want console data
// L.__debug__ = true
//
L.log = function() {
  if (window.console && L.__debug__) {
    // TODO: Chrome doesn't let us call apply on console.log.
    // Interpolate variable arguments manually and construct
    // a single-argument call to console.log for Chrome.
    try {
      console.log.apply(this, arguments);
    } catch(e) {
      try {
        var i = 0;
        var n = arguments.length;
        for (;i<n;++i) { console.log(arguments[i]); }
      } catch(ee) {
        L.log = function() {};
      }
    }
  }
};