[shmerl]

Autohinter did make things better for the "i" letter (but not completely).

Here is my final result for adding to $HOME/.config/fontconfig/fonts.conf

    <!-- Fixing DuckDuckGo font -->
    <match target="font">
      <test name="family">
        <string>@font-face:DDG_ProximaNova</string>
      </test>
      <edit mode="assign" name="autohint">
        <bool>true</bool>
      </edit>
      <edit mode="assign" name="lcdfilter">
        <const>lcddefault</const>
      </edit>
    </match>