I'm an Android user so I'm not sure what the situation is for IOS but, on Android at least, you can't change download location. This is really annoying as I have to constantly move files after downloading. Please fix this.
Came here just because of this, will have to revert back to Chrome on mobile which is really sad. Changing the location in about:config does nothing, and my phone can't manage the main Downloads folder, rendering it useless as firefox won't allow me to change the location.
This has been an issue since 2014...almost 10 years. No wonder firefox sees less and less users
On android there's currently no way to choose the save location for files, nor is there an option to rename files before saving them. No social media sites add an automatic tag to an image to show which user it belongs to, so this would be a very convenient feature.