I launched a "Firefox 100" webcompat experiment on Nightly today to test whether sites break when they see a User-Agent string with a three-digit Firefox version number. Nightly will hit version 100 in March 2022. Chrome will hit version 100 about a month before Firefox.

50% of Nightly users will get a "Firefox 100" UA string for four weeks. I've been browsing with a "Firefox 100" UA string for four months and only found one broken site: Slack's emoji button was broken, but has been fixed: https://github.com/webcompat/web-bugs/issues/67866

I ran a similar "Firefox 100" experiment in August, but the results were meaningless because a bug in my experiment code caused Firefox to forget the version 100 User-Agent string after restart. Thanks to Dennis Schubert for finding and fixing my bug!

If you find a broken site, please file a webcompat bug on https://webcompat.com/

https://experimenter.services.mozilla.com/nimbus/firefox-100-user-agent-nightly-95-96

chris

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