@buegelfrei,

if you want to add content or replace the title on a particular tab using the “pop_{$this->current_tab}_title” filter.

this is how you use it

function add_replace_title_on_post_tab( $title ){
$title . "add something after the title";
return $title;
}add_filter( 'pop_recent_title', 'add_replace_title_on_post_tab' );

or you can replace the entire content using the “pop_recent_posts_content” filter.