/usr/share/rhythmbox/plugins/fmradio/fmradio-popup.ui is in rhythmbox-plugins 3.0.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <?xml version="1.0"?>
<interface>
<menu id="fmradio-popup">
<section>
<item>
<attribute name="label" translatable="yes">Delete</attribute>
<attribute name="action">app.clipboard-delete</attribute>
</item>
</section>
<section>
<item>
<attribute name="label" translatable="yes">Properties</attribute>
<attribute name="action">app.clipboard-properties</attribute>
</item>
</section>
</menu>
</interface>
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