I need a Plugin – I forgot its name

Hey folks, hope you all are doing good,
So I had a plugin and because I didn’t used it for a while I forget its name, that plugin is used to know what file is powering the current.
When activating it, if you are in a blog post, it will show that the page is powred by the file single.php for example.
I need that plugin please,
Thank you.

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