Still reproduces if I activate [Chrome mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/), so this probably is not a UA-sniffing issue, but perhaps an actual platform difference of some sort.
Bug 1925606 Comment 2 Edit History
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Still reproduces if I activate [Chrome mask](https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/), so this probably is not a UA-sniffing issue. There may be an actual platform difference of some sort, or something where Gmail is taking different codepaths based on some browser-specific feature other than the UA string.