Heads up: "Firefox 100" webcompat experiment

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Chris Peterson

Aug 30, 2021, 6:16:39 PMAug 30
to Firefox Dev
I will be launching a "Firefox 100" webcompat experiment on Nightly this
week 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

If you find a broken site, please file a webcompat bug on


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AJ Jordan

Aug 31, 2021, 1:19:12 AMAug 31
to Chris Peterson, Firefox Dev, nightly...@mozilla.org
Is there a way to disable this experiment in case of bad site breakage?

Also CC'ing nightly-testers as an FYI.


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Andrei Oprea

Aug 31, 2021, 4:28:47 AMAug 31
to AJ Jordan, Chris Peterson, Firefox Dev, nightly...@mozilla.org

Experiments you are enrolled in are listed on about:studies where you can also unenroll. Btw once you do that you can’t go back.

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