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Even if you're not a power-user of the Web, the chances are you are using some form of advert-blocking tool. For Chrome and Firefox users, you're probably using AdBlock. Not on April 1, you're not. For one day only, it has transformed into CatBlock, where adverts, which would normally be displayed are replaced with cats. Don't worry, your favourite sites haven't been hacked or had cat images injected into them. It's just your ad-blocker having a laugh at your expense.