This started since the last FF update. I have no issues with Chrome. Thank you

This can happen if you block remote fonts that are downloaded from internet or otherwise block website fonts. Make sure you allow pages to choose their own fonts. *Settings -> General: Fonts & Colors -> Advanced<br>[X] "Allow pages to choose their own fonts, instead of your selections above" If you use uBlock Origin make sure not to "block remote fonts". Start Firefox in <b>Troubleshoot Mode</b> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <b>hardware acceleration</b> or <b>userChrome.css</b> is causing the problem. *switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes *do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window *https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems