Tor Browser<span class="application">[Tor Browser](https://www.torproject.org)</span> is a rwebranded version of the [ browser based on [Mozilla Firefox|](https://www.mozilla.comorg/firefox/]] web browser. Given its popularity many of you have probably used it before and its user interface is like any other modern web browser.) but configured to protect your privacy.
<span class="application">[Tor Browser](https://www.torproject.org)</span>is a web browser based on [Mozilla Firefox](https://www.mozilla.org/firefox/) but configured to protect your privacy.
Security vulnerabilities in JavaScript have been used to [deanonymize Tor Browser in the past](https://arstechnica.com/information-technology/2013/08/attackers-wield-firefox-exploit-to-uncloak-anonymous-tor-users/).
- If you turned on the [[Persistent Folder|persistent_storage/configure#persistent_folder]] feature of the Persistent Storage, you can also use the *Persistent/Tor Browser* folder to download and upload files from *Tor Browser*. The content of the *Persistent/Tor Browser* folder is saved across different working sessions.
<p>To prevent Tails from running out of memory and crashing, download very big files to the <em>Persistent/Tor Browser</em> folder. All the files that you download outside of the Persistent Storage are stored in memory (RAM), which is more limited.</p>
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).
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*.