On Windows there is a great extension for the preview panel.
It shows the content of the selected file as if it was opened in a code editor.
This is integrated into the preview panel (no popup window), without the need to to press a key combination and closing the preview afterward.
This allows to browse the content very fast (pressing the up/down keys).
I'm aware of the existence of Quick Look plugins, but as far as I know we still need to press command + Y to access the preview and close it after.
Not very handy to quickly go from file to file...
Does anyone know of an equivalent?