[Plugin: Post Meta Inspector] It does not work at all sorry

Hello

The box is empty, just “Key” and “Value”.
In fact the line 66 is the problem :
if ( apply_filters( 'pmi_ignore_post_meta_key', '__return_false', $key ) )
The 2nd parameter is a string and will never be executed as a function, this is the way add_filter() works, not apply_filters().
So you have to do this (tested and OK) :
if ( apply_filters( 'pmi_ignore_post_meta_key', false, $key ) )
I suggest you to add a second filter like this :
if ( apply_filters( 'pmi_ignore_post_meta_' . $key, false ) )

See you !

https://www.ads-software.com/extend/plugins/post-meta-inspector/