Mozilla on Friday said that it had removed two Firefox add-ons from its Web site because they installed malware.

“Two add-ons in the experimental section of addons.mozilla.org were found to be containing malware,” Mozilla said on its security blog. “These were not originally detected with the anti-malware scanning tools that we have been using. We have since increased the number of scanning tools, and will be taking additional steps to minimize the risk of further incidents.”

A leaked report written by MI5, the U.K.’s counter-espionage and security agency, warns that Chinese agents are eavesdropping on and stealing information from U.K. businesses, and trying to obtain trade secrets through blackmail.

The contents of the 14-page restricted report, authored by MI5’s Center for the Protection of National Infrastructure, were revealed over the weekend in The Sunday Times.

After being hit by a cyber attack from China late last year, Google is reportedly seeking guidance on cyber security from the preeminent electronic intelligence agency in the U.S., the National Security Agency (NSA).

Google and the NSA are said to be hammering out an agreement to allow NSA experts to assist in the investigation of the cyber attack, according to The Washington Post. The negotiation aims to define the ways in which Google can share relevant network security information without violating privacy laws or Google policies.