我的CSS文件中有两个webfonts;一种字体和一种图标字体。在Chrome，Firefox和Internet Explorer中，一切都运行得很好，但Firefox Dev Edition 54.0a2在控制台中给了我很多错误（对于字体，而不是图标字体）：
downloadable font: Layout: Lookup flags require GDEF table, but none was found: 8 ... source: ....woff style.css:18:86235
downloadable font: Layout: Failed to parse lookup 0 ... source: ....woff style.css:18:86235
downloadable font: GSUB: Failed to parse lookup list table ... source: ....woff style.css:18:86235
downloadable font: rejected by sanitizer ... source: ....woff style.css:18:86235
downloadable font: Layout: Lookup flags require GDEF table, but none was found: 8 ... source: ....ttf style.css:18:86235
downloadable font: Layout: Failed to parse lookup 0 ... source: ....ttf style.css:18:86235
downloadable font: GSUB: Failed to parse lookup list table ... source: ....ttf style.css:18:86235
downloadable font: rejected by sanitizer ... source: ....ttf
我该怎么办？ 谢谢！