Hi, there 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 Suggest turning Windows on, and do the quick brown fox jumped over..... Please let us know if this solved your issue or if need further assistance.