Here are the mozilla firefox extended support releases. These are mostly used in the organizational environments, where major upgrades are not necessary, or when you want to stay with an older version while keeping the browser's security up-to-date.

Note: These links are logical, means that you will always get the latest version of firefox of the current time.

Note2: Since the firefox ESR channel has also entered into "quontum" releases where many older add-ons are no longer compatible, We have also included the links below to download the last release of firefox legacy version, which was 52.9.0, for both 32 and 64bit operating systems, for those people who were looking to stay with older version due to add-on compatibility problems. To avoid automatic updates, don't forget to disable the internet connection prior to installing version 52, and disable the automatic updates completely from firefox preferences> advance> updates tab. Enable the internet access after saving new settings and you will be good to go. It is also recommended to choose "custom installation" during firefox setup, and not to install "maintenence service" from there. Alternatively, if someone want to use older version along with the newest releases on a system, download and run the portable version of firefox 52 from the download area below. It will not effect your current installation of firefox latest version.