/usr/share/rhythmbox/plugins/ is in rhythmbox-plugins 3.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rhythmbox/plugins/audiocd/
/usr/share/rhythmbox/plugins/audiocd/album-info.ui
/usr/share/rhythmbox/plugins/audiocd/audiocd-toolbar.ui
/usr/share/rhythmbox/plugins/audioscrobbler/
/usr/share/rhythmbox/plugins/audioscrobbler/Last.fm-symbolic.svg
/usr/share/rhythmbox/plugins/audioscrobbler/audioscrobbler-preferences.ui
/usr/share/rhythmbox/plugins/audioscrobbler/audioscrobbler-profile.ui
/usr/share/rhythmbox/plugins/context/
/usr/share/rhythmbox/plugins/context/img/
/usr/share/rhythmbox/plugins/context/img/Allmusic16x16.png
/usr/share/rhythmbox/plugins/context/img/Discogs16x16.png
/usr/share/rhythmbox/plugins/context/img/Wikipedia16x16.png
/usr/share/rhythmbox/plugins/context/img/lastfm.png
/usr/share/rhythmbox/plugins/context/img/spinner.gif
/usr/share/rhythmbox/plugins/context/tmpl/
/usr/share/rhythmbox/plugins/context/tmpl/album-tmpl.html
/usr/share/rhythmbox/plugins/context/tmpl/artist-tmpl.html
/usr/share/rhythmbox/plugins/context/tmpl/links-tmpl.html
/usr/share/rhythmbox/plugins/context/tmpl/loading.html
/usr/share/rhythmbox/plugins/context/tmpl/lyrics-tmpl.html
/usr/share/rhythmbox/plugins/context/tmpl/main.css
/usr/share/rhythmbox/plugins/daap/
/usr/share/rhythmbox/plugins/daap/daap-prefs.ui
/usr/share/rhythmbox/plugins/daap/daap-toolbar.ui
/usr/share/rhythmbox/plugins/daap/remote-icon.png
/usr/share/rhythmbox/plugins/fmradio/
/usr/share/rhythmbox/plugins/fmradio/fmradio-popup.ui
/usr/share/rhythmbox/plugins/fmradio/fmradio-toolbar.ui
/usr/share/rhythmbox/plugins/generic-player/
/usr/share/rhythmbox/plugins/generic-player/generic-player-info.ui
/usr/share/rhythmbox/plugins/generic-player/generic-player-toolbar.ui
/usr/share/rhythmbox/plugins/ipod/
/usr/share/rhythmbox/plugins/ipod/ipod-info.ui
/usr/share/rhythmbox/plugins/ipod/ipod-init.ui
/usr/share/rhythmbox/plugins/ipod/ipod-toolbar.ui
/usr/share/rhythmbox/plugins/iradio/
/usr/share/rhythmbox/plugins/iradio/iradio-initial.xspf
/usr/share/rhythmbox/plugins/iradio/iradio-popup.ui
/usr/share/rhythmbox/plugins/iradio/iradio-toolbar.ui
/usr/share/rhythmbox/plugins/iradio/station-properties.ui
/usr/share/rhythmbox/plugins/lyrics/
/usr/share/rhythmbox/plugins/lyrics/lyrics-prefs.ui
/usr/share/rhythmbox/plugins/magnatune/
/usr/share/rhythmbox/plugins/magnatune/magnatune-loading.ui
/usr/share/rhythmbox/plugins/magnatune/magnatune-popup.ui
/usr/share/rhythmbox/plugins/magnatune/magnatune-prefs.ui
/usr/share/rhythmbox/plugins/magnatune/magnatune-symbolic.svg
/usr/share/rhythmbox/plugins/magnatune/magnatune-toolbar.ui
/usr/share/rhythmbox/plugins/magnatune/magnatune_logo_color_small.png
/usr/share/rhythmbox/plugins/magnatune/magnatune_logo_color_tiny.png
/usr/share/rhythmbox/plugins/mtpdevice/
/usr/share/rhythmbox/plugins/mtpdevice/mtp-info.ui
/usr/share/rhythmbox/plugins/mtpdevice/mtp-toolbar.ui
/usr/share/rhythmbox/plugins/rblirc/
/usr/share/rhythmbox/plugins/rblirc/rhythmbox_lirc_default
/usr/share/rhythmbox/plugins/replaygain/
/usr/share/rhythmbox/plugins/replaygain/replaygain-prefs.ui