I have also been experiencing this issue on a 32 bit system and as far as I can tell it only happens when trying to save images into a folder already containing a lot of files. Both of the folders that get me every time have 1500+ images in them (coincidentally 1554 and 1557 files respectively). It makes me wonder if there's a certain threshold number of files where this starts to happen. Saving the images elsewhere works perfectly (so long as I don't browse into those folders and lock kmozillahelper up).
I have also been experiencing this issue on a 32 bit system and as far as I can tell it only happens when trying to save images into a folder already containing a lot of files. Both of the folders that get me every time have 1500+ images in them (coincidentally 1554 and 1557 files respectively). It makes me wonder if there's a certain threshold number of files where this starts to happen. Saving the images elsewhere works perfectly (so long as I don't browse into those folders and lock kmozillahelper up).