In jsfiddle.net, I have this simple code:
console.log('yep');
alert('hello');
I can see the alert window but nothing in my firebug
console.
Is there a reason why ?
I'm encountering it as well on my FF15. In my case, it is caused by the built-in "web console" in "web developer" Ctrl+Shift+K
https://developer.mozilla.org/en-US/docs/Tools/Web_Console
Beginning with Firefox 4, the old Error Console has been deprecated in favor of the new, improved Web Console. The Web Console is something of a heads-up display for the web, letting you view error messages and other logged information. In addition, there are methods you can call to output information to the console, making it a useful debugging aid, and you can evaluate JavaScript on the fly.