Sen. Ron Wyden, D-Ore., at a Feb. 24 hearing of the Senate Committee on Energy and Natural Resources. Wyden asked online-testing firm ProctorU to bolster its cybersecurity. (Photo by Leigh Vogel-Pool/Getty Images)
Researchers believe hackers used Chrome extensions and other malicious tools — along with domains issued by a single registrar — to spy on computer users. (Getty Images)