Firefox 89 arrives with controversial Proton interface Jun 1, 2021 07:38 EDT with 19 comments Mozilla’s Firefox 89 releases to the general public today complete with the new Proton interface which simplifies the browser’s menus and alters the tabs bar beyond anything we’ve seen from previous Firefox releases or other web browsers. This update also improves macOS integration and includes further privacy enhancements. The first thing that people will notice in this update is the Proton interface, the browser chrome and toolbar have been simplified so that redundant and less frequently used features have been removed, menus have been altered so that the most used features are prominent and visual noise has been reduced.