The extension to prevent the mining of cryptocurrencies on the computer called No Coin is now available for the free Opera browser.

No Coin is an extension of the Opera browser that blocks web miners who use the power of the user's CPU to mine cryptocurrencies without them knowing it. For some versions the Opera browser has incorporated an ad blocker into its extensions, but after the most recent update No Coin is available as an option to download. No Coin uses a blacklist blocking software such as Coinhive.

The repository of the NoCoin list can be found in Github. It is MIT certified and open source. It can be used in computer browsers with AdBlock, Adblock Plus and uBlock Origin extensions. For mobile devices it is available with Adblock Browser and since Opera version 50 of Opera browser is available automatically.

This could be effective against Coinhive, a code that is added to web portals and undermines the Monero cryptocurrency without the user knowing it. One of the best-known cases of using Coinhive to earn revenue was on the famous Illegal Downloads page The Pirate Bay, but many others have included the code.

An example of this type of activity is the use of streaming of series and movies belonging to the CBS channel, which has been shown to use this code to mine cryptocurrencies. The devices were forced by the Showtime. com portals and its subsidiary ShowtimeAnytime. com to lend about 60% processing power while users visited the site, to perform calculations regarding this transaction validation work of Monero's blockchain.

No Coin is an extension of Chrome since September. Later FireFox also added the extension that prevents web miners from mining without the user's consent.

Recently, a team of researchers demonstrated that the mining of cryptocurrencies using the browser has evolved and has developed a modality for the miner to continue taking advantage of the processing power of others even when the user has closed all the visible windows. When this is the case, 50% of the CPU capacity is still used by a browser-linked process.

In an exclusive interview for Criptonoticias, computer security researcher and creator of Bad Packets Report, Troy Mursch, described this type of activity as a kidnapping not known to users and explained that "an unregulated web miner can use all the CPU available (100% total). This is definitely notorious and disturbing for laptop and desktop users. Mobile users will notice that their devices are heating up and their battery is rapidly depleted when crypto hijacking is taking place.