/usr/share/xul-ext/ubiquity/scripts/content-preview.js is in xul-ext-ubiquity 0.6.4~pre20140729-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | var Ubiquity = {
// TODO: Implement this, instead of inserting it insecurely from chrome.
insertHtml: function insertHtml() {},
resizePreview: function resizePreview() {},
onPreview: null
};
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