(Mozilla Firefox) How to check if my Mozilla Firefox browser is updated or not & how to update it?

By default, Firefox updates automatically. You can always check for updates at any time, in which case an update is downloaded, but it is not installed until you restart Firefox.

Update Firefox

1. Click the menu button at the right side of the Firefox toolbar, go to Help, and select About Firefox. The About Mozilla Firefox window will open.
2. Firefox will check for updates automatically. If an update is available, it will be downloaded.

   

3. When the download is complete, click Restart to update Firefox.

   

Configure how Firefox installs updates

1. Click the menu button and select Settings.
2. In the General panel, go to the Firefox Updates section.

For more info, click on this link here: Update Firefox to the latest release