Many fonts don't render when Firefox opens local html file

I'm using a 3rd-party program called Fontlist. It reads all fonts in the Windows fonts folder, and then uses a user-chosen line of text to generate an html file on the hard drive that shows the line of text displayed in each font. Since it's a 3rd-party program, I don't have control over it's html programming.
When the generated html file is browsed with Internet Explorer, all fonts display correctly. When browsing it with Firefox, perhaps half or more of the fonts have an ordinary-looking backup font substituted. I've not been able to discern any pattern as to what kind of font displays correctly or does not.
In researching the problem online, I saw a hint that setting security.fileuri.strict_origin_policy to false might fix the issue. I tried it, and it did not have any effect. Also, in the Fonts and Colors Advanced option, I've checked the box to let web pages choose their own fonts.
Might there be any other settings that would enable Firefox to render virtually any industry-standard font installed on the system? This can affect any html files from 3rd-party sources, not just Fontlist.

Do the font-family names that have a space have quotes around them?
*font-family:"Aldine 721";
See also:
*https://developer.mozilla.org/en-US/docs/Web/CSS/font-family
<blockquote>Font family names must either be given quoted as strings, or unquoted as a sequence of one or more identifiers. This means that punctuation characters and digits at the start of each token must be escaped in unquoted font family names.</blockquote>

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Many fonts don't render when Firefox opens local html file

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