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That looks really bad. I use Linux as well, but hadn't checked the rendering in Firefox. Have to change it. Pity, it looked good in Chrome

This looks like the font file you're using lacks some rendering hints (all points that touch the median line should be annotated as such, it looks like they aren't).

Another version of the same font or the same font from another source may work. Webfont sites often try to tweak the hinting tables, they're trying to make the fonts look better but it breaks stuff all the time.

It's weird, it looks good on my machine, using FF25 on Ubuntu.

It's nowhere near that bad, but it doesn't exactly look great on Chrome OS X.

And again in Chrome on Win 8.

This how it looks for me. http://i.imgur.com/9wNxAZM.png

Chrome Version 32.0.1700.72 m on Windows 8.1

Similar on android

Looks OK to me on android - http://i.imgur.com/JqV9bK0.jpg