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After Facebook and Twitter, Google has cracked down on malicious cryptocurrency mining extensions on its Chrome platform. Until now, Google Chrome's web policy permitted cryptocurrency mining in extensions as long as it is the extension's single purpose and the user is adequately informed about the mining behaviour. "Unfortunately, approximately 90 per cent of all extensions with mining scripts that developers have attempted to upload to Chrome Web Store have failed to comply with these policies, and have been either rejected or removed from the store," James Wagner, Extensions Platform Product Manager, said in a blog post late Monday.