gnome-sushi - 46.0-2 main

Sushi is a Gtk+ and Javascript-based quick previewer
for Nautilus, the GNOME desktop file manager.
Sushi is a DBus-activated service. It is capable of previewing
documents, PDFs, sound and video files (using GStreamer),
some text files, and possibly others in the future.
.
To activate the preview, left-click the file and hit space.
The preview can be closed by hitting space again, or escape.