Roughly 12% of Firefox users on release and beta channels are running Windows XP. That’s almost as many as are using Windows 10 (15%) and almost
double how many users we have on Mac (6.7%).
(For the record, Linux users on these two channels make up less than 1%)
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edit – oh, and please remember that the usual rules of Data Science apply: I’m only able to analyse what is being provided. So if a disproportionate number of Firefox users on, say, Linux aren’t reporting Telemetry on release or beta channels, they will be undercounted in the presented numbers]
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It might interest you to know that Windows XP users are more likely to have configured their Firefox to run in the Russian, Polish, or Spanish locales. They are less likely to have configured it to use the English or German locales.
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Windows XP Firefox user is far less likely to be in the United States or Germany, and is slightly less likely to be in Great Britain, France, or Japan. Instead, a Windows XP Firefox user is somewhat more likely to be in Russia, Poland, India, the Ukraine, Egypt, Spain, or Italy.
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A good predictor of engagement is having Firefox set as the default browser on a system, so a lower proportion of “default browser: Yes” for Windows XP users might signal lower engagement. However, the data shows that Windows XP Firefox users are more likely to have Firefox set as their system’s default browser (even accounting for
how difficult it now is in Windows 10 to set non-Edge browsers to be the system default).
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Data says: Windows XP Firefox users are much more likely to have 0 addons installed than the Firefox users in general, so maybe the choice of browser was made for them? Maybe they don’t know about addons at all.
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Edit – I don’t have data to back up my assertion that “A good predictor of engagement is having Firefox set as the default browser on a system” and :dolske told me about an experiment Firefox ran where we just didn’t ask users to set us as their default browser. In the experiment, user retention and active hours did not decrease. Desktop users’ engagement is apparently unaffected by what browser is opened if you click on a link in another program.