thomq: Instead it offers setting a CSS stylesheet which can be used to change the font and just about anything else. I think the font setting I described above is simpler.
Since GOG aren't content with the default font and just set "sans-serif", but instead set a specific font to use (seems to be Open Sans, by the way, with a generic sans-serif as backup), I don't think changing the browser's settings for default fonts would matter (perhaps the size settings would). Instead, I think setting up a local CSS file is the way to go.
I suggest the
Stylish add-on for Firefox, Chrome, Opera, and Safari.
I think the previous style sheet said to use Lucida Grande, Arial, Verdana, and the generic sans-serif, in that order.
A stylesheet to get it back as it was:
body {
font-family: "Lucida Grande", Arial, Verdana, sans-serif !important
}
You can, of course, switch out the list of fonts for whatever you want to use (come on now, I know you
really want comic sans), just make sure to use quotation marks if your preferred font has whitespace characters in their name.