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If I "View source" in my browser I get a bunch of stuff in the end of my html output. It starts with console.groupCollapsed("Application Log");.

I guess this is something Craft does automatically. Is it possible to turn it off when I launch my site?

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This is something Craft only shows if your site is in devMode (

If you use Firebug or Chrome Developer Tools for instance, it shows you a performance and error log.

By disabling devMode, it disappears. Do this by setting 'devMode' => false into your craft/config/general.php.

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Just turn off devMode in your general config:

return array(
    'devMode' => false,

Also check out the knowledge-base article: What does Dev Mode do?

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