(Hoping that perhaps hiro can take a look or pass along to someone who could. Note that this is easy to do by accident -- I ran into this by accident, in fact -- if you just press your touchpad a bit too hard while doing a swipe-to-nav gesture.)
Bug 1812211 Comment 3 Edit History
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(Hoping that perhaps hiro can take a look or pass along to someone who could. I suspect the "open context menu while swiping" workflow isn't a core use-case :) but it's easy to trigger by accident, if you just press your touchpad a bit too hard while doing a swipe-to-nav gesture. That's how I ran across this, at least.)