Hi Bambacha,

I cannot find any concrete solutions to your problem, so I will recommend the following.

1. Clearing the cache 2. Clearing Download History 3.If the previous 2 did not work, try reinstalling Firefox on your device, although make sure to keep a back-up in the event you lose any bookmarks, tabs, etc.

More information here: https://support.mozilla.org/en-US/kb/cant-download-or-save-files

I cleared the cache and all the app's data and the problem persists. The download history is empty, since I can't download anything. I removed all the add-ons and logged out of my account (in order to stop the syncing), still nothing. I uninstalled it completely rebooting the phone and reinstalled it. Still nothing. I changed the download location from my external SD to the internal memory, still nothing.

Hi,

This is how the new version works(V79 and up) apparently! I had this problem on 

my phone (Redmi Note 8T+Android 9) until V81.1.3. After that download failure rate comes down from 100% of files to 50%!(I had to switch to chrome to download)

I had to uninstall this rubbish new version and install the V68.11 from APKmirror
to get a working Firefox ( i had to do this because i don't like how chrome handles
Personal data...etc)

So a previous version works? I guess I have to rollback to that version.

Still, I cannot think this problem as solved.

UPDATE: I just factory reset my phone and it seems the downloads work now. Don't know what was off, but it works now. Consider this problem solved.