We are rolling out a new stand-alone device hub manager that will replace the Firefox Kit. The main advantage is that the device manager is not packaged along with a specific version of Firefox ESR and you can now choose to use and keep up with the latest version of Firefox, even none ESR versions.
Solution
The Device Hub Manager has been rebuilt to allow for an independent installation, which will work with any Firefox version and in particular the latest. This change provides a much simpler and secure deployment of Firefox and ensures that you can easily keep up with the latest version of Firefox, e.g., with automatic updates.