This is why *Tor Browser* integrates all kinds of security protections inside the browser as well.

It is impossible to hide to the websites that you visit that you are using Tor, because the [list of exit nodes of the Tor network is public](https://metrics.torproject.org/exonerator.html).

That is why many more websites ask you to solve a CAPTCHA when using *Tor Browser*.

The anonymity provided by *Tor Browser* works by making all users look the same to make it impossible to know who is who among the millions of users of *Tor Browser*.

Tails tries to make it as difficult as possible for websites to distinguish Tails users from other users of *Tor Browser*. If it was possible for a website to determine whether you are a user of *Tor Browser* inside or outside of Tails, this would provide a little bit more information about you and reduce your anonymity.

Refer to the [[fingerprint section of our list of known issues |support/known_issues#fingerprint]] to know if there are differences between the fingerprints of *Tor Browser* inside and outside of Tails.

A difference is that Tails includes the *uBlock Origin* extension, which removes advertisements. If an attacker can determine that you are not downloading the advertisements that are included in a webpage, that could reveal that you are a Tails user.

Notice the padlock icon on the left of the address bar saying "mail.riseup.net". Notice also the address beginning with "https://" (instead of "http://"). These are the indicators that an encrypted connection using [[!wikipedia HTTPS]] is being used.

[Tor Support: How HTTPS encryption and Tor works in Tor Browser to enhance your privacy and anonymity](https://support.torproject.org/about-tor/security/https-encryption-and-tor/)

**Save and restart** to apply the change.

<p>All this message means is that the automatic updates feature of
<i>Tor Browser</i> has been disabled. This is done
intentionally in Tails to make sure that no security feature or configuration
gets broken by automatic updates of
<i>Tor Browser</i>.</p>

Click on the padlockSelect the [[!img tor-circuit.png alt="Tor Circuit" class="symbolic"
link="no"]] button in the address bar to show the relays in the Tor circuit
that is used to connect to the website in the current tab, its 3 relays, their countries, and IP addresses.

Select the [[!img tor-circuit.png alt="Tor Circuit" class="symbolic"
link="no"]] button in the address bar to show the relays in the Tor circuit
that is used to connect to the website in the current tab.

The last relay in the circuit, the one immediately above the destination website, is the *exit relay*. Its country might influence how the website behaves.

Clears the session state including cache, history, and cookies.

Closes all existing web connections and creates new Tor circuits.

<p>Restart Tails instead.</p>

The letterboxing feature of *Tor Browser* works by adding gray margins to the browser window when the window is resized. The webpage remains as close as possible to the desired size without revealing the actual size of the window.