By default, Firefox updates automatically. You can always update manually, in which case an update is downloaded but not installed until you restart Firefox.
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 Windows Install Firefox on Linux How to download and install Firefox on Mac for more information).
- 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 .
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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.
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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.