It has only stated today after installing KDE's system settings and configuring it to make KDE apps look native . Firefox has started using a thinner font.
so how do i make it use the default fonts ?
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up.
Sign up to join this communityWhat you are seeing is font hinting.
First, play with the font rendering settings in KDE and see if it fixes your problem.
You can probably disable it in about:config
by searching for the preferences starting with "gfx" and testing them out.