I tried several vim-like browsers such as uzbl, vimb and dwb recently.
All they have in common is the Fuzzy fonts rendering in some pages such as stackexchang or github.

I've searched and found out the problem is cause by a bitmap font named Clean. I added this to my ~/.config/fontconfig/fonts.conf but I had no luck.
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<selectfont>
<rejectfont>
<pattern>
<patelt name="family">
<string>Clean</string>
</patelt>
</pattern>
</rejectfont>
</selectfont>
</fontconfig>
Is there a way to fix this problem (preferably without sacrificing all of my bitmap fonts).