oliver, 3 months ago @ladyteruki without add-ons you can't so anything. but there's one that may be exactly what you are looking for: uBlacklist ( https://addons.mozilla.org/en-US/firefox/addon/ublacklist )
@ladyteruki without add-ons you can't so anything. but there's one that may be exactly what you are looking for: uBlacklist ( https://addons.mozilla.org/en-US/firefox/addon/ublacklist )