Since 2 days firefox cant open pages anymore .It doesnt even try to load them, there is just a half second blink on the small refresh icon in the adressbar and nothing else. the only "pages" it still opens are the firefox internal option pages like "about:support" everything else gets no response i cant even connect to my router. the Problem appeared out of the blue i closed firefox opened it up again after a minute or so and since then it wont work. at the moment im using chrome so there is no problem with my internet connection.

what i tried already: starting firefox in safemode, reinstalling firefox, disabling avira and windows firewall, disabling ipv6 support, using the refresh feature