Hi Nico. You posted with a Firefox 52 ESR version on the Windows XP platform. This platform is no longer supported and Firefox 52.9.0 is the last version for this platform. Current Firefox releases require Windows 7 and newer. Users on Windows XP and Vista have been moved to the Firefox 52 ESR version. *https://support.mozilla.org/en-US/kb/end-support-windows-xp-and-vista *https://support.mozilla.org/en-US/kb/your-hardware-no-longer-supported