/usr/lib/firefox/platform.ini is in firefox 59.0.2+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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BuildID=20180406121424
Milestone=59.0.2
SourceRepository=https://hg.mozilla.org/releases/mozilla-release
SourceStamp=239e434d6d2b8e1e2b697c3416d1e96d48fe98e5
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