/usr/share/xul-ext/custom-tab-width/chrome.manifest 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.
1 2 3 4 | content tab-width chrome/content/
style chrome://browser/content/browser.xul chrome://tab-width/content/browser.css
overlay chrome://browser/content/browser.xul chrome://tab-width/content/browser.xul
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