/usr/share/javascript/xterm/addons/ is in libjs-xterm 2.7.0+ds1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/javascript/xterm/addons/attach/
/usr/share/javascript/xterm/addons/attach/attach.js
/usr/share/javascript/xterm/addons/attach/index.html
/usr/share/javascript/xterm/addons/attach/package.json
/usr/share/javascript/xterm/addons/fit/
/usr/share/javascript/xterm/addons/fit/fit.js
/usr/share/javascript/xterm/addons/fit/package.json
/usr/share/javascript/xterm/addons/fullscreen/
/usr/share/javascript/xterm/addons/fullscreen/fullscreen.css
/usr/share/javascript/xterm/addons/fullscreen/fullscreen.js
/usr/share/javascript/xterm/addons/fullscreen/package.json
/usr/share/javascript/xterm/addons/terminado/
/usr/share/javascript/xterm/addons/terminado/package.json
/usr/share/javascript/xterm/addons/terminado/terminado.js