The problem I'm referring to has nothing to do with fuzzy-fonts or with Cantarell. Please read the following bug-report and article that describes the problem I'm referring to. The problem affects a very wide variety of fonts and how they're rendered in web-browsers. Using desktop environment tools such as gnome-tweak-tool does not fix the problems.
I'm just looking for more information and some indication that the problem can be fixed eliminating the need for external scripts or manual configuration.