Chrome and Firefox version 100 may break the internet

In the coming weeks, Google‘s Chrome browser, Mozilla’s Firefox browser, and Microsoft’s Edge browser will be updated to version 100 . After a 97 version that emphasized personal data protection , browsers are currently at version 98. This new update might seem totally normal, but it could wreak havoc on the Internet .

Upgrading to version 100 in the coming weeks may cause bugs or compatibility issues on some websites that are not ready to read three-digit user-agent strings . Google, Mozilla and Firefox are therefore currently working to mitigate the impact of the update before its launch later this year.


In August 2021, Mozilla ran a series of tests to determine if three-digit version numbers could cause issues, and found that a small number of websites were not displaying or functioning properly. Among the impacted sites, we can mention Yahoo, Slack, Daimler, Bethesda or HBO Go . In most of Mozilla’s tests, websites indicated that the browser was not supported or had problems displaying the user interface on certain parts of the sites.

The various market players are therefore implementing different strategies to mitigate the impact of version 100 on the stability of websites. Firefox will be able to fix the issue on a site-by-site basis , while Chrome has a backup option that will flag an old version 99 user-agent if any issues are found.

For some, this might remind you of the infamous Year 2000 bug and Microsoft’s abandonment of Windows 9 . Indeed, this version would have caused conflicts with other already existing versions, including Windows 95 and Windows 98. Chrome , Firefox and Edge should upgrade to version 100 around April.

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