/etc/xul-ext/kwallet5.js is in xul-ext-kwallet5 1.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | // Place your preferences for xul-ext-kwallet5 in this file.
// You can override here the preferences specified in
// /usr/lib/xul-ext/kwallet5/defaults/preferences/prefs.js
|