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Opera 50 Web Browser Will Offer Anti-Bitcoin Cryptocurrency Mining Feature (betanews.com)
BrianFagioli writes: The upcoming version 50 of the Opera web browser will offer an integrated anti-Bitcoin mining feature. Besides Bitcoin, it will also block the mining of other cryptocurrencies such as Litecoin and Ethereum. If you aren't aware, some websites are hijacking user computers to mine for cryptocurrencies. This is not only a potential violation of trust, but it can negatively impact the computer's performance too. Mining is also a huge waste of electricity. Opera 50 will offer an optional setting that, when enabled, blocks this nonsense.
That's only because you are paying for the time nd the energy
if the energy is paid for by others and the time is parallel over a large enough group of systems, then the efficiency doesn't matter for the person doing the mining.