Hello,

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Screen shot provided... hope this helps

This looks like a problem with fonts.

This can happen when Firefox has a problem to access locally installed fonts because of sandbox security issues. https://wiki.mozilla.org/Security/Sandbox

You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting.

security.sandbox.content.level = 1

Close and restart Firefox to make the change effective.

If '1' still doesn't have an effect then try '0' to disable the sandbox.

If this didn't work then undo/reverse the change and reset the pref via the right-click context menu to the default value.

Type about:config<enter> in the address bar. If a warning screen comes up, press the I Accept the Risk button. At the top of the screen is a search bar.

To all: there wasn't a security.sandbox.content.level = 1 listed when I accessed [about.config] So I went to settings in win10 and uninstalled Firefox. Then reinstalled it. Seems to have solved the issue. Thanks for the effort FredMcD.

That was very good work. Well done.