Hi, a little fast to jump backwards when there is a fix . As it appears to be an issue that only affects users who have turned off cleartype font rendering within their windows settings. So a workaround for the moment would either be to turn cleartype back on or disabling hardware acceleration in Firefox: https://support.mozilla.org/en-US/kb/performance-settings There is am sure but I do not know how to turn it off. There are reasons why there are updates, like to fix the above that is really a Microsoft issue. The other is Security updates like for the Meltdown and Spectre issues. Can read release notes here : https://www.mozilla.org/en-US/firefox/releases/ Please let us know if this solved your issue or if need further assistance.