Popular Chrome extension has been removed from the Chrome Web Store after it started spamming users with annoying pop-up ads. The Automatic 4K/HD for Youtube extension was used by over 4 million Chrome users to force YouTube into playing videos at high quality. The unwanted ads took advantage of Chromes desktop notification feature, in breach of Googles developer policies. Google has now removed the offending extension from the Google Web Store. In the past a number of browser extensions and plugins have either been purchased from their original creators (or even, in some cases, hijacked by hackers)”]