extra code in – blank jquery function

As per comments: this code is not doing anything.

To find the culprit, first change your theme to a standard one to see if the theme is adding it. If yes, check header.php if it is hardcoded there or else functions.php for any instances of add_action('wp_head'..., where it might be lingering.

If it’s not the theme, switch on/off all plugins to see which one is adding it. If you’ve found the plugin, see if there’s an option that might be doing this. In any case, it’s not harmful, so if you trust the plugin, just leave it at that.

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