Choosing a Firefox CPU architecture for Windows OS

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We recommend using Firefox 64 bit builds in compatible environments although system administrators should select the CPU architecture that best matches their constraints. In any case, migrating from 32 bit Firefox to 64 bit Firefox should be done after significant QA cycles.</p> <h1 id="w_desktop-compatibility">Desktop compatibility</h1> <table> <caption> </caption> <tbody> <tr> <th></th> <th>Firefox 32 bit</th> <th>Firefox 64 bit</th> </tr> <tr> <td>32 bit OS</td> <td>Supported</td> <td>Not supported</td> </tr> <tr> <td>64 bit OS</td> <td>Supported</td> <td>Supported</td> </tr> <tr> <td>Systems with more than 2 GB RAM</td> <td>Supported</td> <td>Supported</td> </tr> <tr> <td>Systems with 2 GB RAM or less</td> <td>Supported</td> <td>Supported but not recommended<br> (lower performance)</td> </tr> </tbody> </table> <h1 id="w_benefits-and-limitations-of-64-bit-firefox">Benefits and limitations of 64 bit Firefox</h1> <table> <caption> </caption> <tbody> <tr> <th></th> <th>Firefox 32 bit</th> <th>Firefox 64 bit</th> </tr> <tr> <td>Lower crash rates</td> <td>No</td> <td>Yes (we observed a crash rate reduction<br> in the order of 50% to 60% after migrating<br> release channel users to 64 bit Firefox)</td> </tr> <tr> <td>Higher security (<a href="https://translate.google.com/website?sl=pl&tl=cs&hl=en-GB&u=https://en.wikipedia.org/wiki/Address_space_layout_randomization">ASLR</a>)</td> <td>No</td> <td>Yes</td> </tr> <tr> <td>32 bit only extensions</td> <td>Yes</td> <td>No (vendors may have 64 bit compatible<br> extensions though)</td> </tr> </tbody> </table> <div class="warning"> <strong>Citrix XenApp users</strong> willing to use 64 bit Firefox, see <a href="https://support-mozilla-org.translate.goog/en-US/kb/64-bit-firefox-crashes-citrixs-xenapp-vm?_x_tr_sl=pl&_x_tr_tl=cs&_x_tr_hl=en-GB">64-bit Firefox crashes with Citrix's XenApp VM</a>. </div> </section> <p class="share-link"><br> Share this article: <a href="https://translate.google.com/website?sl=pl&tl=cs&hl=en-GB&u=https://mzl.la/3QemCL2">https://mzl.la/3QemCL2</a></p> </article> <section class="sumo-page-section hide-on-large"> <div class="document-vote elevation-01 text-center"> <form class="document-vote--form helpful" action="/en-US/kb/choosing-firefox-cpu-architecture-windows-os/vote" method="post"><input type="hidden" name="csrfmiddlewaretoken" value="ZZTrldq7nk3jFjLH9lpu9MTbTl3nqG3QizGN8VnxATGEVVTCINEbwNH3dR9HavXU"> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"><input type="hidden" name="revision_id" value="176781"> <input type="hidden" name="source" value="footer"> <button type="submit" class="btn helpful-button" name="helpful"><span class="hidden-text">Yes</span>👍</button> <button type="submit" class="btn not-helpful-button" name="not-helpful"><span class="hidden-text">No</span>👎</button> <img class="wait" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/spinner.18d6c26adc937688.gif" alt="Please wait..."> </div> </form> </div> </section> <section id="doc-contributors" class="document--contributors sumo-page-section"> <p class="help-title text-body-md">These fine people helped write this article:</p> <div class="document--contributors-list text-body-xs"> <a class="user secondary-color" rel="nofollow" href="https://support-mozilla-org.translate.goog/en-US/user/AliceWyman/?_x_tr_sl=pl&_x_tr_tl=cs&_x_tr_hl=en-GB">AliceWyman</a>, <a class="user secondary-color" rel="nofollow" href="https://support-mozilla-org.translate.goog/en-US/user/michro/?_x_tr_sl=pl&_x_tr_tl=cs&_x_tr_hl=en-GB">Michele Rodaro</a>, <a class="user secondary-color" rel="nofollow" href="https://support-mozilla-org.translate.goog/en-US/user/heyjoni/?_x_tr_sl=pl&_x_tr_tl=cs&_x_tr_hl=en-GB">Joni</a> </div> </section> <section class="sumo-page-section"> <div class="card card--callout is-full-width has-moz-headings"> <div class="card--callout-wrap-narrow"><img class="card--feature-img" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/volunteer.a3be8d331849774b.png" alt="Illustration of hands"> <div class="card--details"> <h3 class="card--title">Volunteer</h3> <p class="card--desc">Grow and share your expertise with others. 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