This topic seems to have not been solved over a year ago. I have had this problem for quite some time but just ignore it. Used to be I could right click "open containing folder" in a FF download and it would do that. It no longer does that - nothing happens. I did the recommended handling in this post and the linked post and it didn't fix it. Any suggestions?
Also, I used to be able to just open the downloads folder and what was downloaded was there which is why it wasn't THAT big of a deal but now when I open the folder the new DL isn't there "yet". It will be later and I haven't figured out what makes it become visible eventually but by the time it does I've gotten distracted and just grumble. This must be related.