By default, Firefox is set to automatically update itself but you can always do a manual update. Here's how:
- Click the menu button , click help and select About Firefox.On the menu bar click the Firefox menu and select About Firefox.
- The About Firefox window will open and Firefox will begin checking for updates and downloading them automatically.
- When the updates are ready to be installed, click Restart Firefox to Update.
Stay safe: Download only from the official Mozilla links above to avoid malware.
To change update settings, see Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox.