153 lines
11 KiB
HTML
153 lines
11 KiB
HTML
<h1 id="about_config" class="anchor"><a href="#about_config"><i class="fas fa-link anchor-icon"></i></a> Firefox: Advanced Privacy Tweaks using "about:config"</h1>
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<div class="alert alert-success" role="alert">This is a collection of privacy-related <strong>about:config</strong> tweaks. We'll show you how to enhance the privacy of your Firefox browser.</div>
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<h3>Preparation:</h3>
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<ol>
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<li>Enter "about:config" in the firefox address bar and press enter.</li>
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<li>Press the button "Accept the Risk and Continue"</li>
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<li>Copy and paste each of the preferences below (for example "<strong>webgl.disabled</strong>") into the search bar, and set each of them to the stated value (such as "true").</li>
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</ol>
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<h4>Firefox Desktop:</h4>
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<h5 id="fpid" class="anchord"><a href="#fpi"><i class="fas fa-link anchor-icon"></i></a> First Party Isolation</h5>
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<p>These settings should be safe, however first party isolation may break some third party login systems.</p>
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<dl class="long-string-list">
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<dt>privacy.firstparty.isolate = true</dt>
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<dd>A result of the <a href="https://wiki.mozilla.org/Security/Tor_Uplift">Tor Uplift</a> effort, this preference isolates all browser identifier sources (e.g. cookies) to the first party domain, with the goal of preventing tracking across different domains. (Don't do this if you are using the Firefox Addon "Cookie AutoDelete" with Firefox v58 or below.)</dd>
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<h5 id="rfpd" class="anchor"><a href="#rfpd"><i class="fas fa-link anchor-icon"></i></a> Resist Fingerprinting</h5>
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<p>One of the features of resist fingerprinting is to set the reported browser timezone to UTC. If you depend on having your real time zone reported to the websites you visit, this setting may break that.</p>
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<dt>privacy.resistFingerprinting = true</dt>
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<dd>A result of the <a href="https://wiki.mozilla.org/Security/Tor_Uplift">Tor Uplift</a> effort, this preference makes Firefox more resistant to browser fingerprinting.</dd>
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<h5 id="blockOut" class="anchor"><a href="#blockOut"><i class="fas fa-link anchor-icon"></i></a> Block outbound</h5>
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<dt>browser.send_pings = false</dt>
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<dd>The attribute would be useful for letting websites track visitors' clicks.</dd>
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<dt>Disable Firefox prefetching pages it thinks you will visit next:</dt>
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<dd>
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Prefetching causes cookies from the prefetched site to be loaded and other potentially unwanted behavior. Details <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ">here</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control">here</a>.
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<ul>
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<li>network.dns.disablePrefetch = true</li>
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<li>network.dns.disablePrefetchFromHTTPS = true</li>
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<li>network.predictor.enabled = false</li>
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<li>network.predictor.enable-prefetch = false</li>
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<li>network.prefetch-next = false</li>
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</dd>
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<h5 id="locbar" class="anchor"><a href="#locbar"><i class="fas fa-link anchor-icon"></i></a> Location bar</h5>
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<dt>browser.urlbar.speculativeConnect.enabled = false</dt>
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<dd>Disable preloading of autocomplete URLs. Firefox preloads URLs that autocomplete when a user types into the address bar, which is a concern if URLs are suggested that the user does not want to connect to. <a href="https://www.ghacks.net/2017/07/24/disable-preloading-firefox-autocomplete-urls/">Source</a></dd>
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<h5 id="plugins" class="anchor"><a href="#plugins"><i class="fas fa-link anchor-icon"></i></a> Plugins</h5>
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<dt>media.eme.enabled = false</dt>
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<dd>
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<p>Disables playback of DRM-controlled HTML5 content, which, if enabled, automatically downloads the Widevine Content Decryption Module provided by Google Inc. <a href="https://support.mozilla.org/kb/enable-drm#w_opt-out-of-cdm-playback-uninstall-cdms-and-stop-all-cdm-downloads">Details</a></p>
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<p>DRM-controlled content that requires the Adobe Flash or Microsoft Silverlight NPAPI plugins will still play, if installed and enabled in Firefox.</p>
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</dd>
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<dt>media.gmp-widevinecdm.enabled = false</dt>
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<dd>Disables the Widevine Content Decryption Module provided by Google Inc., used for the playback of DRM-controlled HTML5 content. <a href="https://support.mozilla.org/kb/enable-drm#w_disable-the-google-widevine-cdm-without-uninstalling">Details</a></dd>
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<h5 id="hwfping" class="anchor"><a href="#hwfping"><i class="fas fa-link anchor-icon"></i></a> Hardware Fingerprinting</h5>
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<dt>media.navigator.enabled = false</dt>
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<dd>Websites can track the microphone and camera status of your device.</dd>
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<h5 id="pstorage" class="anchor"><a href="#pstorage"><i class="fas fa-link anchor-icon"></i></a> Persistent Storage</h5>
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<dt>network.cookie.cookieBehavior = 1</dt>
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<dd>
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Disable cookies. 2 is likely to break some sites. 4 is the default default. 1 is more strict than 4.
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<ul>
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<li>1 = Only accept from the originating site (block third-party cookies)</li>
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<li>2 = Block all cookies by default</li>
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<li>4 = Block Cross-site and social media trackers</li>
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</ul>
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</dd>
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<h5 id="headref" class="anchor"><a href="#headref"><i class="fas fa-link anchor-icon"></i></a> Headers/Referers</h5>
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<dt>network.http.referer.XOriginPolicy = 2</dt>
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<dd>
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Only send <code>Referer</code> header when the full hostnames match. (Note: if you notice significant breakage, you might try <code>1</code> combined with an <code>XOriginTrimmingPolicy</code> tweak below.) <a href="https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/">Source</a>
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<ul>
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<li>0 = Send <code>Referer</code> in all cases</li>
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<li>1 = Send <code>Referer</code> to same eTLD sites</li>
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<li>2 = Send <code>Referer</code> only when the full hostnames match</li>
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</ul>
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</dd>
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<dt>network.http.referer.XOriginTrimmingPolicy = 2</dt>
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<dd>
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When sending <code>Referer</code> across origins, only send scheme, host, and port in the <code>Referer</code> header of cross-origin requests. <a href="https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/">Source</a>
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<ul>
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<li>0 = Send full url in <code>Referer</code></li>
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<li>1 = Send url without query string in <code>Referer</code></li>
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<li>2 = Only send scheme, host, and port in <code>Referer</code></li>
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</ul>
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</dd>
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<h5 id="mediad" class="anchor"><a href="#mediad"><i class="fas fa-link anchor-icon"></i></a> Media</h5>
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<p>This may break some websites which use VOIP based features.</p>
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<dt>webgl.disabled = true</dt>
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<dd>WebGL is a potential security risk. <a href="https://security.stackexchange.com/questions/13799/is-webgl-a-security-concern">Source</a></dd>
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<h5 id="sessions" class="anchor"><a href="#sessions"><i class="fas fa-link anchor-icon"></i></a> Sessions and session restoration</h5>
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<dt>browser.sessionstore.privacy_level = 2</dt>
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<dd>
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This preference controls when to store extra information about a session: contents of forms, scrollbar positions, cookies, and POST data. <a href="http://kb.mozillazine.org/Browser.sessionstore.privacy_level">Details</a>
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<ul>
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<li>0 = Store extra session data for any site. (Default starting with Firefox 4.)</li>
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<li>1 = Store extra session data for unencrypted (non-HTTPS) sites only. (Default before Firefox 4.)</li>
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<li>2 = Never store extra session data.</li>
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</ul>
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</dd>
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<h5 id="misc" class="anchor"><a href="#misc"><i class="fas fa-link anchor-icon"></i></a> Miscellaneous</h5>
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<dt>beacon.enabled = false</dt>
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<dd>Disables sending additional analytics to web servers. <a href="https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon">Details</a></dd>
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<dt>network.IDN_show_punycode = true</dt>
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<dd>Not rendering IDNs as their Punycode equivalent leaves you open to phishing attacks that can be very difficult to notice. <a href="https://krebsonsecurity.com/2018/03/look-alike-domains-and-visual-confusion/#more-42636">Source</a></dd>
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<h5 id="sb" class="anchor"><a href="#sb"><i class="fas fa-link anchor-icon"></i></a> Safe Browsing</h5>
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<dt>browser.safebrowsing.downloads.remote.enabled = false</dt>
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<dd>Prevents Firefox from sending information about downloaded executable files to Google Safe Browsing to determine whether it should be blocked for safety reasons. <a href="https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work#w_what-information-is-sent-to-mozilla-or-its-partners-when-phishing-and-malware-protection-are-enabled">Details</a></dd>
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<h4>Firefox Android (Fenix):</h4>
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<h5 id="fpia" class="anchor"><a href="#fpia"><i class="fas fa-link anchor-icon"></i></a> First Party Isolation</h5>
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<p>These settings should be safe, however first party isolation may break some third party login systems.</p>
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<dt>privacy.firstparty.isolate = true</dt>
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<dd>A result of the <a href="https://wiki.mozilla.org/Security/Tor_Uplift">Tor Uplift</a> effort, this preference isolates all browser identifier sources (e.g. cookies) to the first party domain, with the goal of preventing tracking across different domains. (Don't do this if you are using the Firefox Addon "Cookie AutoDelete" with Firefox v58 or below.)</dd>
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<h5 id="rfpa" class="anchor"><a href="#rfpa"><i class="fas fa-link anchor-icon"></i></a> Resist Fingerprinting</h5>
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<p>One of the features of resist fingerprinting is to set the reported browser timezone to UTC. If you depend on having your real time zone reported to the websites you visit, this setting may break that.</p>
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<dt>privacy.resistFingerprinting = true</dt>
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<dd>A result of the <a href="https://wiki.mozilla.org/Security/Tor_Uplift">Tor Uplift</a> effort, this preference makes Firefox more resistant to browser fingerprinting.</dd>
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<dt>privacy.resistFingerprinting.letterboxing = true</dt>
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<dd>This sets the resolution of your Firefox window to a standard resolution. Only use this if you are using the above <strong>privacy.resistFingerprinting</strong>
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<h5 id="mediaa" class="anchor"><a href="#mediaa"><i class="fas fa-link anchor-icon"></i></a> Media</h5>
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<p>This may break some websites which use VOIP based features.</p>
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<dt>webgl.disabled = true</dt>
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<dd>WebGL is a potential security risk. <a href="https://security.stackexchange.com/questions/13799/is-webgl-a-security-concern">Source</a></dd>
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<dt>Disable WebRTC</dt>
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<dd>See <a href="#webrtc"><i class="fas fa-link"></i> WebRTC</a> section</dd>
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<h3 id="user.js">Firefox user.js Templates</h3>
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<ul>
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<li><a href="https://github.com/arkenfox/user.js">arkenfox user.js</a> An ongoing comprehensive user.js template for configuring and hardening Firefox privacy, security and anti-fingerprinting. <strong>Desktop Firefox Only</strong></li>
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</ul>
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<h3>Related Information</h3>
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<ul>
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<li><a href="https://blog.privacytools.io/firefox-privacy-an-introduction-to-safe/">Firefox Privacy: Tips and Tricks for Better Browsing</a> - A good starting guide for users looking to keep their data private and secure.</li>
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<li><a href="https://ffprofile.com/">ffprofile.com</a> - Helps you to create a Firefox profile with the defaults you like.</li>
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<li><a href="https://addons.mozilla.org/firefox/addon/privacy-settings/">Privacy Settings</a> - A Firefox add-on to alter built-in privacy settings easily with a toolbar panel.</li>
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<li><a href="https://12bytes.org/articles/tech/firefox/the-firefox-privacy-guide-for-dummies/">Firefox Privacy Guide For Dummies</a> - Guide on ways (already discussed and others) to improve your privacy and safety on Firefox.</li>
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</ul>
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