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Note that this is a new feature for Firefox's PDF reader, but not a new feature of PDFs in general.

Adobe had to update reader back in like... 2008?... to prompt before loading external resources. Because companies were embedding Google Analytics into PDFs.

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> Because companies were embedding Google Analytics into PDFs.

Wow! This is daft. Thank the FLOSS gods for things like Pi-Hole because I never realised this. And if I hadn't blocked Google Analytics there, this would have been a sad state of affairs.

> Thank the FLOSS gods for things like Pi-Hole

Can't edit my comment any more, but I realise this is quite dismissive of the work the real maintainers have put in. So I'll thank them instead!

That's not dismissive, you just called them gods!

I bet the real reason for that was because it could then compete with adobes own analytics built into the reader.

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