The latest version of Firefox (version 51.0) which was recently released in late January included a change that caused the Flatter Files Extension to no longer work. The breaking change they made also results in the automatic update of the extension from working. As soon as we realized this issue we prioritized development and quickly resolved the issue. Unfortunately, due to the automatic update being broken you must install a new version of the Flatter Files Extension manually by downloading and running the installer located at We apologize for this inconvenience and will ensure moving forward that the extension is tested with each version of Firefox before it is released.

The Flatter Files Extension is used to print with Adobe Reader and view content in local applications. Once installed, it will work in both Chrome and Firefox providing you with a consistent print experience and easy access to viewing your content in local applications.

If you have any questions, please do not hesitate to contact us at [email protected].