Strange/broken font rendering
1. Some of font characters replaced with square signs. http://gyazo.com/2582ddcc765d1a14d11e4fb06974fd43 2. All fonts replaced with Serif regardless of Firefox font configuration (I set Sans Serif by default). http://gyazo.com/f0a58663d6d8c0353719b2b9e6ee1e40
Chosen solution
The missing icons are supplied by a font that is downloaded from the server (@font-face) as you can probably see by little boxes that show the hex code of the characters.
Make sure that you allow pages to choose their own fonts.
- Firefox > Preferences > Content : Fonts & Colors > Advanced: [X] "Allow pages to choose their own fonts, instead of my selections above"
You can check the gfx.downloadable_fonts.enabled pref on the about:config page and make sure that it is set to true (if necessary double-click the line to toggle its value).
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Chosen Solution
The missing icons are supplied by a font that is downloaded from the server (@font-face) as you can probably see by little boxes that show the hex code of the characters.
Make sure that you allow pages to choose their own fonts.
- Firefox > Preferences > Content : Fonts & Colors > Advanced: [X] "Allow pages to choose their own fonts, instead of my selections above"
You can check the gfx.downloadable_fonts.enabled pref on the about:config page and make sure that it is set to true (if necessary double-click the line to toggle its value).
Completely solved the issue. The toggle is unchecked by accident. After enabling it all worked well. Thank you!