Manually Updating Firefox Open the Firefox app. It's a round icon depicting a fox curled around a globe. Click on the ☰ icon and select Help from the dop-down list. Click on About Firefox. Firefox will open a dialog box, then automatically check for and download any available updates. Click on Restart Firefox to Update in the dialog box.How do I setup Mozilla Firefox?
Go to the Windows Start menu and click the Settings icon. Click Apps, then choose Default Apps on the left pane. Scroll down and click the entry under Web browser. Click on Firefox in the dialog that opens with a list of available browsers. Firefox is now listed as your default browser.How can I download old version of Firefox?
How to download old versions of Firefox. Downloading the latest version of Firefox for your PC is simple. Point your browser at the site, click "Free Download" and you’ll automatically get the latest version that matches your PC. If you regularly need to download another build, though, life gets more complicated.