Microsoft’s Internet Explorer (IE) and Edge browsers tumbled last month in user share as the once-universal programs ran on just one in every six personal computers worldwide.

According to U.S. analytics vendor Net Applications, the user share of IE and Edge – an estimate of the world’s personal computer owners who ran that browser – plummeted by 3.3 percentage points to end November at 16.3%. The decline was the largest ever for Microsoft’s browsers.

Mozilla’s Firefox also stumbled badly last month, losing nearly 2 of its hard-won percentage points, slipping to 11.4%, its lowest user share since October 2016.

These numbers, and more importantly the fact that IE+Edge’s and Firefox’s numbers sank to such a degree, is striking. But it was as much a data reset by Net Applications as proof of massive user desertions.

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