This file is indexed.

/etc/xul-ext/custom-tab-width.js is in xul-ext-custom-tab-width 1.0.1-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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// Place your preferences for xul-ext-custom-tab-width in this file.
// You can override here the preferences specified in
// /usr/share/xul-ext/custom-tab-width/defaults/preferences/defaults.js