3.0.x-and-above/upload/admin/controller/extension/module/facebook_business.php [308:326]:
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    public function eventPostViewCommonDashboard($route, &$data, &$output) {
        $this->load->language('extension/module/facebook_business');
        $this->load->model('extension/module/facebook_business');

        if ($this->model_extension_module_facebook_business->isNewExtensionAvailable()) {
            $search = '<div class="container-fluid">';

            $pos = strrpos($output, $search);

            if ($pos !== false) {
                $html =  '<div class="container-fluid">';
                $html .= '  <div class="alert alert-info"><i class="fa fa-exclamation-circle"></i> ' . $this->language->get('text_upgrade_message');
                $html .= '    <button type="button" class="close" data-dismiss="alert">&times;</button>';
                $html .= '  </div>';

                $output = substr_replace($output, $html, $pos, strlen($search));
            }
        }
    }
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2.3.x-and-above/upload/admin/controller/extension/module/facebook_business.php [301:319]:
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    public function eventPostViewCommonDashboard(&$route, &$data, &$output) {
        $this->load->language('extension/module/facebook_business');
        $this->load->model('extension/module/facebook_business');

        if ($this->model_extension_module_facebook_business->isNewExtensionAvailable()) {
            $search = '<div class="container-fluid">';

            $pos = strrpos($output, $search);

            if ($pos !== false) {
                $html =  '<div class="container-fluid">';
                $html .= '  <div class="alert alert-info"><i class="fa fa-exclamation-circle"></i> ' . $this->language->get('text_upgrade_message');
                $html .= '    <button type="button" class="close" data-dismiss="alert">&times;</button>';
                $html .= '  </div>';

                $output = substr_replace($output, $html, $pos, strlen($search));
            }
        }
    }
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