This does work in Nightly when I toggle the slider in our "[Chrome Mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/)" diagnostic extension -- see screencast that I just attached. So this is definitely a bug with the code-that-Google-sends-specifically-to-Firefox.
Bug 1926259 Comment 8 Edit History
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This does work in Nightly when I toggle the slider in our "[Chrome Mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/)" diagnostic extension -- see screencast that I just attached. So this is definitely a bug with the code-that-Google-sends-specifically-to-browsers-that-say-they-are-Firefox.
This does work in Nightly when I toggle the slider in our "[Chrome Mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/)" diagnostic extension -- see screencast that I just attached, where I'm just visiting the not-signed-in version of https://www.google.com/ (just that URL, no query-params or anything), in Firefox Nightly. So, this is definitely caused by the code-that-Google-sends-specifically-to-browsers-that-say-they-are-Firefox.
This does work in Nightly when I toggle the slider in our "[Chrome Mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/)" diagnostic extension -- see screencast that I just attached, where I'm just visiting the not-signed-in version of https://www.google.com/ (just that URL, no query-params or anything), in Firefox Nightly 134.0a1 So, this is definitely caused by the code-that-Google-sends-specifically-to-browsers-that-say-they-are-Firefox.