The search giant told vnunet.com that the acquisition was completed earlier this month, but declined to provide specific terms of the deal.
A notice on GreenBorder's website says that the company has stopped selling its security software, and that customers will be supported until their existing contracts expire.
The software uses a virtualisation technique known as a 'sandbox', in which the browser runs entirely within a separate secured system.
This prevents any attacks or exploits from using flaws in the browser to access system resources and run malware.
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff