@Nick, if the issue is easy to trigger in your setup would it be possible to at least test on a machine if installing a recent version of firefox would fix the issue?
as for your question about flag/profiler I don't have any suggestion offhand and would need to investigate but again you might have more eyes on the question if it's asked upstream so I would recommend adding a comment to the report Amin referenced
@Nick, if the issue is easy to trigger in your setup would it be possible to at least test on a machine if installing a recent version of firefox would fix the issue?
as for your question about flag/profiler I don't have any suggestion offhand and would need to investigate but again you might have more eyes on the question if it's asked upstream so I would recommend adding a comment to the report Amin referenced