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<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.
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[[!img lib/apps/tor-browser.png link=no alt=""]]
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Sending your connections to websites through the Tor network is not enough to totally protect you while browsing the web:
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Cookies can be used to track and identify you across different websites.
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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/).
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This is why *Tor Browser* integrates all kinds of security protections inside the browser as well.
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Some frequently asked questions about <span class="application">Tor Browser</span> can be found in
[[the FAQ|support/faq#browser]].
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<h1 id="proxy">The proxy server is refusing connections</h1>
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The following error message in *Tor Browser* means that Tails is not yet connected to the Tor network:
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The proxy server is refusing connections
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Make sure that you are:
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[[Connected to a local network|anonymous_internet/networkmanager]]
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[[Connected to the Tor network|anonymous_internet/tor]]
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<h1 id="confinement">Security confinement</h1>
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*Tor Browser* is only allowed to save the downloads and read the files that you
specify in the file chooser of GNOME.
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For example, thanks to this confinement, even if an attacker manages to exploit a security vulnerability in *Tor Browser*, they wouldn't be able to access all the content of your Persistent Storage.
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<p>To prevent Tails from running out of memory and crashing, download
very big files to the <i>Persistent/Tor Browser</i> folder.
The files that you download outside of the Persistent Storage are
stored in memory (RAM), which is more limited.</p>
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<p>In [[Tails 6.14.1|news/version_6.14.1]] (April 2025), we improved the
previous confinement and you can now safely download to and read from any
folder in your <i>Home</i> folder or Persistent Storage.</p>
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Still, some file operations are not allowed in *Tor Browser*:
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When opening HTML files from the *Files* browser, *Tor Browser* displays the following error:
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