Tor Browser es un navegador web basado en Mozilla Firefox y configurado para proteger tu anonimato. Dándote la popularidad de Firefox, puede que ya lo hayas usado antes, siendo su interfaz de usuario como la de cualquier otro navegador web moderno.

Algunas preguntas frecuentes acerca del navegador puedes encontrarlas en el FAQ.

Aquí hay algunas cuantas cosas que vale la pena mencionar en el contexto de Tails.

Si quieres navegar páginas en tu red local, lee nuestra documentación sobre acceder recursos en tu red local.

Confinamiento de AppArmor

En Tails, Tor Browser está confinado con AppArmor para proteger al sistema y a tu información de algunos tipos de ataques contra Tor Browser. Como consecuencia, sólo puede leer y escribir un número limitado de carpetas.

Es por esto que podrías enfrentar errores de Denegación de permisos, por ejemplo si intentas descargar archivos a la carpeta Home.
  • Puedes guardar lo archivos desde Tor Browser a la carpeta Tor Browser que se encuentra en la carpeta Home. El contenido de esta carpeta desaparecerá cuando apagues Tails.

  • Si quieres subir archivos con Tor Browser, cópialos a esa carpeta primero.

  • If you have activated the Personal Data persistence feature, then you can also use the Tor Browser folder that is located in the Persistent folder. In that case, the content of this folder is saved and remains available across separate working sessions.

To be able to download files larger than the available RAM, you need to activate the Personal Data persistence feature.

Encriptación HTTPS

Using HTTPS instead of HTTP encrypts your communication while browsing the web.

All the data exchanged between your browser and the server you are visiting are encrypted. It prevents the Tor exit node to eavesdrop on your communication.

HTTPS also includes mechanisms to authenticate the server you are communicating with. But those mechanisms can be flawed, as explained on our warning page.

For example, here is how the browser looks like when we try to log in an email account at, using their webmail interface:

Notice the padlock icon on the left of the address bar saying "" and the address beginning with "https://" (instead of "http://"). These are the indicators that an encrypted connection using HTTPS is being used.

You should try to only use services providing HTTPS when you are sending or retrieving sensitive information (like passwords), otherwise its very easy for an eavesdropper to steal whatever information you are sending or to modify the content of a page on its way to your browser.

HTTPS Everywhere

HTTPS Everywhere is a Firefox extension included in Tor Browser and produced as a collaboration between The Tor Project and the Electronic Frontier Foundation. It encrypts your communications with a number of major websites. Many sites on the web offer some limited support for encryption over HTTPS, but make it difficult to use. For instance, they may default to unencrypted HTTP, or fill encrypted pages with links that go back to the unencrypted site. The HTTPS Everywhere extension fixes these problems by rewriting all requests to these sites to HTTPS.

To learn more about HTTPS Everywhere you can see:


Tor alone is not enough to protect your anonymity and privacy while browsing the web. All modern web browsers, such as Firefox, support JavaScript, Adobe Flash, cookies and other services which have been shown to be able to defeat the anonymity provided by the Tor network.

In Tor Browser all such features are handled from inside the browser by an extension called Torbutton which does all sorts of things to prevent the above type of attacks. But that comes at a price: since this will disable some functionalities and some sites might not work as intended.

Protection against dangerous JavaScript

Having all JavaScript disabled by default would disable a lot of harmless and possibly useful JavaScript and render unusable many websites.

That's why JavaScript is enabled by default in Tor Browser.

But we rely on Torbutton to disable all potentially dangerous JavaScript.

We consider this as a necessary compromise between security and usability and as of today we are not aware of any JavaScript that would compromise Tails anonymity.

To understand better the behavior of Tor Browser, for example regarding JavaScript and cookies, you can refer to the Tor Browser design document.

Security slider

You can use the security slider of Torbutton to disable browser features as a trade-off between security and usability. For example, you can use the security slider to disable JavaScript completely.

The security slider is set to low by default. This value provides the default level of protection of Torbutton and the most usable experience.

To change the value of the security slider, click on the green onion button and choose Privacy and Security Settings.

Security slider in its default value (low)

Circuit view feature

The Circuit view feature of Torbutton shows you the three Tor relays used for the website in the current tab, including the corresponding IP addresses and the countries they're located in. The node immediately above the Internet node is the Exit relay; the country it is located in might determine how the website is presented to you. You can use New Tor Circuit for this Site to change to another country.

You can use Onion Circuits to get more detailed information about the circuits being used.

New Tor Circuit for this Site feature

The New Tor Circuit for this Site feature of Torbutton builds a new Tor Circuit for the website in the current tab and reloads it. This is particularly useful if the Exit relay is located in a country which negatively affects the presentation of the website you are visiting, e.g. due to censorship, localization into a language you do not know, and similar.

To use it, click on the green onion button and select New Tor Circuit for this Site.

New Identity feature

The New Identity feature of Torbutton:

  • Closes all open tabs.
  • Clears the session state including cache, history, and cookies (except the cookies protected by the Cookie Protections feature).
  • Closes all existing web connections and creates new Tor circuits.
  • Erases the content of the clipboard.

To use this feature click on the green onion button and select New Identity.

This feature is not enough to strongly separate contextual identities in the context of Tails as the connections outside of Tor Browser are not restarted.

Shutdown and restart Tails instead.

For more details, see the design and implementation of the Tor Browser.

NoScript to have even more control over JavaScript

To allow more control over JavaScript, for example to disable JavaScript completely on some websites, Tor Browser includes the NoScript extension.

By default, NoScript is disabled and some JavaScript is allowed by the Torbutton extension as explained above.

For more information you can refer to the NoScript website and features.