Install Mozilla Firefox Open your Internet browser and go to the Mozilla Firefox download page. Click the Free Download button in the center of the page. Once the download has completed, click Run or on the download itself (usually in the lower-left corner of your browser window). Follow the prompts to install Mozilla Firefox.How do you load Mozilla Firefox?
Visit the Mozilla website. The Download link in the green box will automatically detect your operating system and language. If you want to download Firefox in another language, or for a different operating system, click the Systems & Language link right below the Download button. Click the download button.How do I download old versions 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.