I have been using firejail for sandboxing my application in Ubuntu. It has a --private option. I was using
firejail --private=/home/user/Desktop firefox
When I try to download a file from Firefox it stores it in a directory called Download inside firejail. Is it possible to get it to store in /home/user/Desktop?
Firejail manpage says:
--private Mount new /root and /home/user directories in temporary filesystems. All modifications are discarded when the sandbox is closed.
Example: $ firejail --private firefox--private=directory Use directory as user home.
Example: $ firejail --private=/home/netblue/firefox-home firefox
So this means that Firefox will see /home/user/Desktop as /home/user/, and you should be able to store downloaded files in /home/user/Desktop without doing anything else (assuming default profile).
I have tested it with firejail 0.9.58.2 with the default profile plus the --private=/home/user/Desktop flag on Debian 10.
If Firefox is automatically saving it to the newly created Downloads folder when run with the --private=dir flag, then you should just disable the auto saving feature of downloaded files in Firefox: Preferences -> General -> Files and Applications -> Always ask where to save files. When you do that, and when firefox asks for where to download, the folder that you see as user (home dir) in firefox is actually /home/user/Desktop.
Edit: It is normal that the Firefox settings get reset every time you start in --private=dir, because to Firefox this is your home folder and it looks for the config files .mozilla. If it cannot find it, it will create one for you, with the default settings. Invoke firefox normally with /usr/bin/firefox, then change the download setting I mentioned. After that copy ~/.mozilla directory to /home/user/Desktop and finally you can run firefox with the --private=/home/user/Desktop option.
