Microsoft’s Internet Explorer (IE) again lost a big chunk of market share last month as Mozilla’s Firefox and Google’s Chrome continued to chip away at the world’s dominant browser, a Web metrics company said last week.

IE plummeted by 1.3 percentage points in September, falling to 65.7%, it’s lowest level ever recorded and the largest one-month drop in almost a year, said Net Applications.

In the last 12 months, IE has lost 8.5 percentage points and has dropped 2.6 points in the last three months alone. Unless Microsoft is able to stem the slide, its browser will slip under the 50% mark in the next two years.