You can see all of these downloads on one page on Mozilla's site here.
Firefox is also available for Android devices via the Google Play store and Apple devices from i Tunes.
If you modify the file with the above line, it will disable automatic Firefox updates. It is therefore tempting to block these updates but that isn’t smart.
Find an alternative for your add-ons or try a tool that doesn’t need to operate inside your browser but update at the earliest.
Another reason to update Firefox, one that often goes unappreciated, is that hundreds of bugs are fixed with each release, Regardless of why, it's easy to update Firefox to the latest version.