OpenSearch report export to PDF/PNG fails on Firefox with some dashboards

[mmguero]

This morning I tried to export a PDF report using the OpenSearch reporting plugin and it just spun and spun then said it failed to download. Is this a general phenomenon or just me? Need to investigate. Hopefully invalid.

EDIT:

I've determined that the export works fine on Google Chrome (tested on both Linux and macOS) and fails on Mozilla Firefox (tested on both platforms as well). Furthermore, a very small dashboard that doesn't have very many visualizations seems to work even on Firefox, while a dashboard like Overview fails consistently.

Still tracking this here although for me now at last knowing there's a workaround and that this is unlikely to be something specifically fixable in Malcolm, the priority has lessened somewhat. I'm going to bump it down the road a bit.