As the person authoring patches for bug 1964150: the first step is to get patches for bug 1956345 landed, though I'm not sure what we're waiting on there either. I'll ping Connor Sheehan to see if there's anything on his end he'd like to see first; it's been a few weeks since I've followed up, and I haven't made any changes during that time.
Bug 1929372 Comment 18 Edit History
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As the person authoring patches for bug 1964150: the first step is to get patches for bug 1956345 landed, though I'm not sure what we're waiting on there either. I'll ping Connor Sheehan to see if there's anything on his end he'd like to see first; it's been a few weeks since I've followed up, and I haven't made any changes during that time. ETA: https://bugzilla.mozilla.org/show_bug.cgi?id=1956345#c7