Font error, only in Mozila Firefox, what is the reason?

Question

css

Please tell me what could be the issue. In all browsers everything is displayed normally without an error, in FireFox, the font is not applied in the error debugger either:
downloadable font: cmap: unexpected range shift (3 != 4) (font-family: "AGHelveticaCyr" style:normal weight:normal stretch :normal src index:0) source: file:///C:/Users/SkyWay/Desktop/%D1%81%D0%B0%D0%B9%D1%82-ver1%20-%20%D0%BA %D0%BE%D0%BF%D0%B8%D1%8F/%D1%81%D0%B0%D0%B9%D1%82/fonts/AGHelveticaCyr.ttf style.css
downloadable font: cmap: failed to parse table (font-family: "AGHelveticaCyr" style:normal weight:normal stretch:normal src index:0) source: file:///C:/Users/SkyWay/Desktop/%D1%81%D0%B0%D0% B9%D1%82-ver1%20-%20%D0%BA%D0%BE%D0%BF%D0%B8%D1%8F/%D1%81%D0%B0%D0%B9%D1%82/ fonts/AGHelveticaCyr.ttf style.css
downloadable font: rejected by sanitizer (font-family: "AGHelveticaCyr" style:normal weight:normal stretch:normal src index:0) source: file:///C:/Users/SkyWay/Desktop/%D1%81%D0 %B0%D0%B9%D1%82-ver1%20-%20%D0%BA%D0%BE%D0%BF%D0%B8%D1%8F/%D1%81%D0%B0%D0%B9 %D1%82/fonts/AGHelveticaCyr.ttf
here is my code to download and use the jsfiddle.net/dudkj7sf
font Firefox version 32.0.3. Yes, and two other fonts loaded in the same way do not give any errors.

Answer 1

When using ttf, everything depends on the conversion of the font to this format. Here in this topic there was exactly the same problem Why won't Firefox load the font?