/usr/share/mozilla-extensions/nukeimage/chrome.d is in mozilla-nukeimage 0.3-12.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | content,install,url,resource:/chrome/nukeimage/content/nukeimage/
locale,install,url,resource:/chrome/nukeimage/locale/en-US/nukeimage/
|