TL;DR get rid of font-weight in the forum’s CSS.
The text of users’ posts has looked absolutely abysmal to me. They are thin to the point of being sparkly and giving me an awful headache.
I did enough investigation to learn that this is not a browser, operating system or monitor issue, but a CSS issue in the forum itself.
I fixed it with Stylish:
@-moz-document domain( us.forums.blizzard.com ){
html, div, article, aside, section, body, .text-base, p, li {
font-weight: normal !important;
}
}
In my opinion font-weight should not be set by the forum and should be removed completely.