A subset of users are often stranded on older versions of Firefox. The graphs above also only look at the most recent version of Firefox. Mozilla has a disclaimer on the site that publishes ADI data to point out that ADI data is imprecise, and from data I have seen actual Active Daily Users are about 10% higher than ADIs but this is just a ballpark estimate. Inversely, Firefox may be active on a day but the user actually wasn’t. A user may be briefly active on a given day but then switches off the machine before Firefox had a chance to phone home. This also explains why ADIs don’t map 1:1 to Active Daily Users (ADUs). Those Firefox installs don’t check over the weekend, so the ADI number drops significantly. The main reason that ADI data is so noisy is that work machines are switched off on the weekend. The ADI number is the aggregate number of these pings that were seen on a given day and can be understood as the number of running Firefox installs on that day. To understand why the data is so variable it’s necessary to understand how Active Daily Installs are calculated.įirefox tries to contact Mozilla once a day to check for security updates. ![]() For the last week the peak was around 80 million users and the low was around 53 million users. Click on the graph to enlarge.ĭuring any given week the ADI number can vary substantially. That effect was temporary as the accelerating decline this year shows (Philipp suggests that the two recent drops could be the result of support for older machines and Windows versions being removed and those users continuing to use previous versions of Firefox, see comments).ĭesktop Firefox Daily Active Installs. It returned to a more modest 10% year over year loss late 2016, which could be the result of a successful marketing campaign (Mozilla’s biggest marketing campaigns are often in the fall). The year over year decline used to be below 10% but accelerated to 14% in 2016. This is a loss of 16 million Firefox installs in a year. Based on this data, 22% fewer Firefox Desktop installations are active today than a year ago. Mozilla’s public data shows that the number of active Firefox Desktop installs running the most recent version of Firefox has been declining for several years. Several commenters criticized the StatCounter data as inaccurate so I decided to take a look at raw installation data Mozilla publishes to see whether it aligns with the StatCounter data. The market share observations in the blog post were based on data provided by StatCounter. I posted a couple weeks ago about Chrome effectively having won the browser wars. ![]() Why building a better browser doesn’t translate to a better marketshare
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