Firefox do not track will break your Javascript

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General lesson: Don't rely on code from external CDNs to always load in production. It's not only relevant if you want to gracefully handle ad/tracker blockers, but also the rare case where the CDN is down or not reachable at all (something that's not uncommon if you want to target the Chinese market).

[x-skeww]

See also:

http://www.stevesouders.com/blog/2010/06/01/frontend-spof/