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By default, Firefox updates automatically. You can always update manually, in which case an update is downloaded but not installed until you restart Firefox.

Please note this video shows an older version of Firefox. The screens shown may have changed.

Note: If you use your Linux distribution's packaged version of Firefox, you will need to wait for an updated package to be released to its package repository. This article only applies if you installed Firefox manually (without using your distribution's package manager).

Click the menu button , click Help and select About Firefox.On the menu bar click the Firefox menu and select About Firefox.
The About Mozilla FirefoxAbout Firefox window opens. Firefox will check for updates and download them automatically.
When the download is complete, click .

Important: If the update didn't start, didn't complete or there was some other problem, you can go to the Systems & Languages page to download and install the latest version of Firefox for your system and language or you can use this download link (see How to download and install Firefox on WindowsInstall Firefox on LinuxHow to download and install Firefox on Mac for more information).

Stay safe: Download only from the official Mozilla links above to avoid malware and other online threats.

Update settings can be changed in Firefox OptionsPreferences. Click the menu button and select .. In the General panel, scroll down to the Firefox Updates section.

This article explains how to download and install Firefox on a Mac.

If you are updating from a previous version of Firefox, see Update Firefox to the latest release.

Note: This article only applies to Mac. For instructions to install Firefox on Windows, see How to download and install Firefox on Windows.For instructions to install Firefox on Linux, see Install Firefox on Linux.

Make sure your Mac meets the System Requirements for Firefox. If you use an old version of OS X, see these articles for more information:

Visit the Firefox download page in any browser (for example, Safari). It will automatically detect the platform and language on your computer and recommend the best version of Firefox for you.
Click .
- Note: If you want to have a choice of the language for your Firefox installation, click the Download options and other languages link instead.
Once the download has completed, the file (Firefox.dmg) may open by itself and pop open a Finder window containing the Firefox application. Drag the Firefox icon on top of the Applications folder in order to copy it there.
Note: If you do not see this window, open the Firefox.dmg file that you downloaded.
After dragging Firefox to the Applications folder, hold down the control key while clicking in the window and select Eject 'Firefox' from the menu.

Complete the steps above before running Firefox. Do not run Firefox directly from the Firefox.dmg file, as this can result in issues such as lost data and settings.

Tip: You can add Firefox to your dock for easy access. Just open your Applications folder and drag Firefox to the dock.

Firefox is now ready for use. Just click on its icon in the dock or Applications folder to start it.

Firefox For Mac Air

When you first start up Firefox, you will be warned that you downloaded Firefox from the Internet. Because you download Firefox from the official site, click .

Firefox For Mac System Requirements

Upon installation, Firefox will not be your default browser, which you'll be notified about. That means that when you open a link in your mail application, an Internet shortcut, or HTML document, it will not open in Firefox. If you want Firefox to do those things, click . If you're just trying out Firefox or simply do not wish to set Firefox as your default browser, click .

Firefox For Mac Faq