Full log message:

Deprecated function: Function create_function() is deprecated in theme_dir_listing_list_view() (line 253 of ..../modules/filebrowser/filebrowser.theme.inc).

PHP Version: 7.2.28
Apache: 2.4
Filebrowser: 1.x-1.1.0 (stable, released 2016)

This is probably the related D7 issue: https://www.drupal.org/project/filebrowser/issues/3061756