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Chrome also uses bdiffs, so updates are significantly smaller.

Firefox uses bsdiff to generate binary diffs for updates: https://wiki.mozilla.org/Software_Update:MAR

It's not quite as efficient as the "Courgette" algorithm used by Chrome, but it's much smaller than downloading a full installer. Hopefully we can use Courgette if the patent issues* are resolved.

* http://ipwatchdog.com/2009/10/31/google-sued-for-patent-infr...

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