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.
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.
This should be a basic feature in any browser, ideally in the browser's settling UI. The fact that you can't even do this in about:config is mind boggling.
For all the people who wants to choose where to download files from Firefox - I made this little thing that will help. It's completely free, but you need to download Automate app and flow created by me. Then just run the flow, choose folder where files are now downloaded and then choose where you want to move them.