With ajax pagination there is an error in Firefox ( Failed to load resource: the server responded with a status of 400 (Bad Request) /wp-admin/admin-ajax.php:1 )
Plugin ver. 2.0.5
I Found problem
Plugin don’t have ajax function for no login users – in “responsive-lightbox/includes/class-galleries.php” need add_action ‘wp_ajax_NOPRIV_rl-get-gallery-page-content’