Fresh install of Manjaro KDE edition as of this morning. Tried a fresh, clean profile, too. Any invocation of file dialog will immediately crash firefox. For instance, right click > save image as, file > save page as or even file > open (ctrl+o).
I submitted this crash dump: https://crash-stats.mozilla.org/report/index/fb9d4f3a-76aa-4cd1-9735-48ff90200315
I can gladly write out a bug report, just not sure who to file it with? Firefox? KDE? Manjaro?