The tracking here is event-based tracking for off-site links from the download page. Any links to other www.mozilla.org pages will be tracked using normal pageview tracking.

Requirements here https://bugzilla.mozilla.org/show_bug.cgi?id=891562 only mention support.mozilla.org and play.google.com. I made it match all off-site links in case the page links change in the future (addons.mozilla.org is also linked from the page).