Keeping your Firefox browser updated to its latest version is very important. Basically, there are a couple of reasons for this, which include functionality and security. Browser updates mostly feature enhancements that you can use for your own advantage. Likewise, browser updates can correct security flaws within the previous version.
Updating Mozilla Firefox
If you already have Firefox installed on your computer, you can download and install directly from the official website: https://www.mozilla.org/en-US/firefox/new/ in order to get the Mozilla Firefox update. This will depend on how you want to configure Firefox by going to Options > Advanced > Update from the main menu. The latest version is 52.0.0 that was released on March 28, 2017.
Mozilla Firefox Has Other Versions
You should know that Firefox could be used in different computer operating systems, such as Windows, Linux, and Mac, available in both 32- and 64-bit. You can have a complete list of downloadable versions of Firefox in this link: https://www.mozilla.org/eng-US/firefox/all/.
At the same time, Firefox can also be used for Android devices, which can be downloaded via Google Play Store. Moreover, iOS devices can download Firefox from the App Store.
Other Sources To Get Firefox
For pre-releases, you can download versions of Firefox through the website of Mozilla, which is: https://www.mozilla.org/en-US/firefox/channel/. However, you should be aware that there are available versions of Firefox that you can download elsewhere. Just be warned that they are available in bundles, which can have additional, unwanted software that can ruin the user experience. Accordingly, you can get into more trouble allow the way if it carries along some malware that can compromise your personal information or expose to third parties, leading to theft, fraud, and other types of cybercrimes.
If you are going to download and install versions of Firefox other than the official site, make sure that it is reliable and secure. The best thing that you can do is to consider Mozilla Firefox update from the official source only.