Search the Internet for alternatives to other software.

For example: "*debian alternatives to photoshop*".

<p>The packages included in Tails are carefully tested for security.
Installing additional packages might break the security built into Tails. For
example, installing OpenVPN might modify the firewall rules that Tails uses to
force network traffic to go through Tor.</p>

Some software might, for example, modify the firewall and break the security built into Tails. But other software like games or office tools are probably fine.

Only applications that are packaged for Debian can be installed and they are under [[public scrutiny|doc/about/trust#trust_debian]].

[*Thunderbird*](https://www.thunderbird.net/), an email client with support for OpenPGP and RSS and Atom news feeds

The same package can be reinstalled faster for some time because you won't have to download it again.

As root, edit */live/persistence/TailsData_unlocked/persistence.conf*, the configuration of the Persistent Storage, and add the *apt-sources.list.d* folder as a feature of type `link`:

Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example, execute the following commands.