The easiest would be to install these example tools
lxsudo mousepad so you can keep copying and pasting these instructions.
Update the package lists.
Upgrade the system.
sudo apt-get dist-upgrade
--no-install-recommends lxsudo mousepad package.
sudo apt-get install --no-install-recommends lxsudo mousepad
The procedure is complete.
Alternatively you could also use other tools which may already be installed by default.
gksudo gedit /etc/torbrowser.d/50_user.conf