It looks like these are always false: https://searchfox.org/mozilla-central/rev/489e82dcc1e5afbe691ff3b1c982382914637e38/browser/components/places/content/places-menupopup.js#740-742,758-760 ... because we transform the panel itself rather than `panel-arrowcontainer`: https://searchfox.org/mozilla-central/rev/9bffd42acf77924313f2e7e30d0e4260e655b727/browser/base/content/browser.css#1129
Bug 1737049 Comment 0 Edit History
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It looks like these are always false: https://searchfox.org/mozilla-central/rev/489e82dcc1e5afbe691ff3b1c982382914637e38/browser/components/places/content/places-menupopup.js#740-742,758-760 ... because we transform the popup itself rather than `panel-arrowcontainer`: https://searchfox.org/mozilla-central/rev/9bffd42acf77924313f2e7e30d0e4260e655b727/browser/base/content/browser.css#1129