For Pinning Private Browsing Tab experiment, we want to SET_PREF and PIN_TO_TASKBAR on click of Pin Private Tab promo button on about:privatebrowsing https://bugzilla.mozilla.org/show_bug.cgi?id=1776934#c1 Without MULTI_ACTION support we can only execute on special action on click on promoButton
Bug 1777386 Comment 1 Edit History
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For Pinning Private Browsing Tab experiment, we want to SET_PREF and PIN_TO_TASKBAR on click of Pin Private Tab promo button on about:privatebrowsing https://bugzilla.mozilla.org/show_bug.cgi?id=1776934#c1 Without MULTI_ACTION support we can only execute on special action on click on promoButton. See https://mozilla.slack.com/archives/G90HG2UQH/p1656545171768649