This file is indexed.

/etc/apport/native-origins.d/firefox 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.

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LP-PPA-ubuntu-mozilla-daily
LP-PPA-ubuntu-mozilla-daily-firefox-aurora
LP-PPA-mozillateam-firefox-next