If it’s just the dirty flag (it was uncleanly unmounted) you can try
ntfsfix -d /dev/sdc1
Still probably better to boot into Windows and let it deal with it (ntfs tools are still reverse engineered stuff after all), and check journalctl before doing it, but it works in a pinch.
Are they based on Firefox ESR? That made me quit Floorp, it was pretty disappointing to be on a legacy reskin of Firefox.