WordPress at a glance
filter is not described

media_upload_default_tab filter-hook . WP 2.5.0

Filters the default tab in the legacy (pre-3.5.0) media popup.

Usage

add_filter( 'media_upload_default_tab', 'filter_function_name_6084' );
function filter_function_name_6084( $type ){
	// filter...

	return $type;
}
$type(string)
The default media popup tab. (From Computer).
Default: 'type'

Where the hook is called

In file: /wp-admin/media-upload.php
media_upload_default_tab
wp-admin/media-upload.php 77
$tab = apply_filters( 'media_upload_default_tab', 'type' );
wp-admin/includes/media.php 87
$current = apply_filters( 'media_upload_default_tab', $default );

Where the hook is used (in WP core)

Does not used.