As in the rest of Firefox would no longer follow `browser.proton.enabled` but it would be around only to be used by about:welcome (via [`NimbusFeatures.aboutwelcome.getValue().isProton`](https://searchfox.org/mozilla-central/rev/f16b7b648f2b294225edd0192f0fbb543327bce9/toolkit/components/nimbus/FeatureManifest.js#49-51))? That should work. Alternatively without changing too much, we could basically undo bug 1704571 and "ungraduate" back to a dedicated new pref, e.g., `browser.aboutwelcome.protonDesign` https://hg.mozilla.org/mozilla-central/rev/9af627d3621212f5af1a2f9874c6eff2ea6b9e57 See attachment…
Bug 1711942 Comment 3 Edit History
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As in the rest of Firefox would no longer follow `browser.proton.enabled` but it would be around only to be used by about:welcome (via [`NimbusFeatures.aboutwelcome.getValue().isProton`](https://searchfox.org/mozilla-central/rev/f16b7b648f2b294225edd0192f0fbb543327bce9/toolkit/components/nimbus/FeatureManifest.js#49-51))? That should work. Alternatively without changing too much, we could basically undo bug 1704571 and "ungraduate" back to a dedicated new pref, e.g., `browser.aboutwelcome.protonDesign` https://hg.mozilla.org/mozilla-central/rev/9af627d3621212f5af1a2f9874c6eff2ea6b9e57 See attachment 9222709 [details]