Bonum Certa Men Certa

Trends That Must Alarm Microsoft and Mozilla

posted by Roy Schestowitz on Oct 25, 2025

A Swiss flag on a flagpole

Months ago: Mozilla Had No Good Reason to Outsource Firefox Development to Microsoft

github.com Traffic

The usage of GNU/Linux has grown, judging by trends in all sorts of former Windows strongholds (such as Switzerland). Yesterday we commented on trends in the US, showing that only one in 7 people uses the only supported version of Windows to access government sites. Put another way, 6 out of 7 Americans either use an already-dead version of Windows or some other operating system. That's a significant change and very meaningful data point. "There were 1.66 billion sessions in the last 30 days," says the site right now. That's a very large data set:

There were 1.66 billion sessions in the last 30 days.

This same data tells us that only 1.7% of users are still with Firefox. As it's below 2%, based on US laws and requirements it means that many sites needn't test for Firefox compatibility anymore:

Web Browsers

Expect Firefox to no longer be supported by various sites in the US.

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