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> Firefox will not send the Origin header with any same-origin requests (bug)

Am I the only one very surprised to hear this? In 2017?

Is there any reason browsers shouldn't just send origin headers along with all requests? Why the exceptions?

Well, it's a bug. It absolutely should send the origin header, but it doesn't ¯\_(ツ)_/¯

I see that it's unclear, but my second set of questions was related to how chrome and safari don't send it for requests caused by img tags.