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How do I force a theme to use WordPress’s jQuery?

Solution:

// only for Themes since WordPress 3.0
function jquery_190() {
    if ( !is_admin() ) { // actually not necessary, because the Hook only get used in the Theme
        wp_deregister_script( 'jquery' ); // unregistered key jQuery
        wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js', false, '1.9.0'); // register key jQuery with URL of Google CDN
        wp_enqueue_script( 'jquery' ); // include jQuery
    }
}
add_action( 'after_setup_theme', 'jquery_190' ); // Theme active, include function

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