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> Why can't I send UDP packets from a browser?

My tweet from May 2015 is titled "I've sent my first UDP packet from a browser!" [1]

Looks like Firefox? Did you write a browser extension?

No, it was an experimental implementation of https://www.w3.org/TR/tcp-udp-sockets/ actually. Regular Firefox browser, not Firefox OS.

Yes, it was Firefox.

I did not write any extensions, I simply turned on an experimental flag for the TCP and UDP Socket API. [1]