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This article explains how to download and install Firefox on Windows using a simplified online installer. (Advanced users: see the For advanced users section at the end of the article.)
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- To update Firefox from a previous version, see Update Firefox to the latest release.
Before installing Firefox, see the Firefox System Requirements to make sure that your computer has the required operating system and recommended hardware.
Do not install Firefox using a limited Windows XP account. For more information, see Microsoft's support article How to determine your user account type in Windows.
- Visit this Firefox download page in any browser, such as Microsoft Internet Explorer or Microsoft Edge.
- Click the button. The Firefox Installer that downloads will automatically offer you the best available version of Firefox for your computer.
- If you use Microsoft Internet Explorer or Microsoft Edge, a notification bar will appear at the bottom of the page with the options to run the installer or save the file to your computer. Click to start the process.
- In other browsers, you may need to first save the Firefox installer to your computer, then open the file you downloaded.
Note: If you see an Open File - Security Warning dialog, click or .
- The User Account Control dialog may open, to ask you to allow the Firefox Installer to make changes to your computer. If this dialog appears, click to start the installation.
- Wait for Firefox to finish installing.
- Note: The Firefox Installer may contain an Update or Re-install button and an option to restore default settings and remove add-ons, if a very outdated Firefox version or very old profile data is detected. Clear the checkbox to keep the old data and click or to start the installation.
- When the installation is complete, Firefox will open.
Having problems?
Here are some articles that can help you:
Mozilla Firefox 43 Free Download Mac Free
- If you see the message, Firefox cannot be installed. This version of Firefox requires a processor with SSE2 support. see Your hardware is no longer supported.
The button on the Firefox download page provides a streamlined online installer that automatically installs a suitable Firefox version for your operating system. For example, on 64-bit Windows, the installer is for the 64-bit version of Firefox (details here).
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Use the Advanced Install Options & Other Platforms link on the Firefox download page if you need a full, offline installer, a Firefox version for a different operating system (such as 32-bit Firefox for 64-bit Windows), or if you want to customize your Firefox installation. Use the Download in another language link to choose your own language.
Options available in the full, offline installer are described in the article, Custom installation of Firefox on Windows.
Starting with Firefox version 49, Firefox requires Mac OS X 10.9 (Mavericks) or higher. Visit this Apple Support page to find your Mac OS version.
If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac.
While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest user experience.