Image Previewer: First Firefox Addon that Injects an In-Browser Miner?

A Firefox extension called Image Previewer was discovered today that not only displays popups, but also injects a Monero in-browser miner into Firefox. While we have seen numerous Chrome extensions injecting in-browser miners, this is the first time I have seen a Firefox addon with this behavior.

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Image Previewer: First Firefox Addon that Injects an In-Browser Miner?

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