Mineralt (inline) miner ?

From the Mineralt website
"Online cryptocurrency miner
Easy way to boost your website or mobile app revenue.
"

"
Web browser miner

Use safe javascript browser miner to mine cryptocurrency online, using your web site visitors’ CPU power. The most effective web miner on the market with the highest mining ratio.
"

In other words, shady shit that allows people whose pages you visit to turn your device into their altcoin/cryptocurrency miner without your consent.
Unless you use an add-on that blocks that type of shit, so good thing you had yourself already covered there.

I don't remember Steamgifts or Opium Pulses mentioning they would be using our browsers for mining.
Though it's possible i missed the announcements.