/usr/lib/firefox/distribution/distribution.ini is in firefox 28.0+build2-0ubuntu2.
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 7 8 9 | [Global]
id=canonical
version=1.0
about=Mozilla Firefox for Ubuntu
[Preferences]
app.distributor = “canonical”
app.distributor.channel = “ubuntu”
app.partner.ubuntu = “ubuntu”
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