From a report: During the past month, both Google and Mozilla developers have added support in their respective browsers for "headless mode," a mechanism that allows browsers to run silently in the OS background and with no visible GUI. [...] While this feature sounds very useful for developers and very uninteresting for day-to-day users, it is excellent news for malware authors, and especially for the ones dabbling with adware. In the future, adware or clickfraud bots could boot-up Chrome or Firefox in headless mode (no visible GUI), load pages, and click on ads without the user's knowledge. The adware won't need to include or download any extra tools and could use locally installed software to perform most of its malicious actions. In the past, there have been quite a few adware families that used headless browsers to perform clickfraud. Martijn Grooten, an editor at Virus Bulletin, also pointed Bleeping Computer to a report where miscreants had abused PhantomJS, a headless browser, to post forum spam. The addition of headless mode in Chrome and Firefox will most likely provide adware devs with a new method of performing surreptitious ad clicks.