The latest Firefox Nightly now includes the fix from bug 1422855. Please download it from https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly (or updated your existing Nightly) and let me know if it helps! If we can get multiple people to confirm that it fixes this bug, I'll try to make a case for uplifting it to 86 for a point release.
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The latest Firefox Nightly now includes the fix from bug 1422855. Please download it from https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly (or updated your existing Nightly) and let me know if it helps! If we can get multiple people to confirm that it fixes this bug, I'll try to make a case for uplifting it to 86 for a dot release.