Firefox 44 supports unicode-range, which can limit font _download_ & use to range of chars you need the font for developer.mozilla.org/en-US/…

unicode-range - CSS: Cascading Style Sheets | MDN

The unicode-range CSS descriptor sets the specific range of characters to be used from a font defined using the @font-face at-rule and made available for use on the current page. If the page doesn't...

developer.mozilla.org
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@davidbaron @leaverou I'm wondering why css3test.com doesn't mark unicode-range as supported for Firefox…
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