How to run external executables within firejail

My machine is home desktop(personal) running Debian Buster with i3 window manager. I recently installed firejail with apt install firejail* firetools and also downloaded the new Firefox 83 browser from Firefox official website. I can run the firefox binary as a non-firejail user, as in, navigating to the new firefox directory and running [user@debian]:$ ./firefox It works fine and all. However, if I try doing, firejail --noprofile --seccomp --private --nonewprivs /home/user/downloads/firefox/firefox it says, the file firefox isn't executable. Running ls -l on the executable returns that it is executable. Then I copied the whole new firefox directory to /tmp/ then opened a new firejail bash session with firejail --seccomp --private --nonewprivs bash, then started a sandboxed bash session. Then copied the firefox directory from /tmp/ to $HOME and tried running the firefox binary from there, and it says permission denied The file was executable, and was owned by same user. What am I doing wrong here.