Hi sorry having a issue : 1st try this please as 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

If this does not fix the issue : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 59.0.1 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

fyi you can do many thinks and have many looks with : USSER CHROME URL'S

• https://www.howtogeek.com/334716/how-to-customize-firefoxs-user-interface-with-userchrome.css/
• http://techdows.com/2017/09/classic-theme-restorer-userchrome-css-modify-firefox-57-photon-ui.html
• https://github.com/Aris-t2/CustomCSSforFx/issues/1
• https://www.accessfirefox.org/Theme-Font-Size-Changer.php
• https://www.userchrome.org/
• https://www.accessfirefox.org/Firefox_Accessibility_Themes.php
• https://www.userchrome.org/what-is-userchrome-css.html
• http://kb.mozillazine.org/UserChrome.css
• https://github.com/axydavid/FirefoxUI/blob/master/README.md
• https://github.com/wilfredwee/photon-australis
• https://www.reddit.com/r/FirefoxCSS/

Note not all code in one place.

Please let us know if this solved your issue or if need further assistance.

Thanks ! I turned on cleartype and it fixed it ! I don't know if the latest Firefox update needed this and prior versions did not, or if it somehow got turned off.

I don't remember having messed with this setting, and definitely not lately, so I am at a loss if / how it got turned off. Maybe a Firefox or Windows update did it ? Hopefully it stays set !

Something is still not quite right with the look of some of my regular sites, but as far as I can tell, nothing serious is wrong, so I might just ignore whatever happened. It is also hard for me to define just what is different, so until I figure it out, I can't really make a specific complaint or search for a fix yet. maybe later ! Seems like I see more white in backgrounds, for instance, but again, I'm not sure what it was like before.

P. S. - I like fixes that don't involve uninstalling/ reloading everything. That is always a pain, I am really glad the first suggestion worked !