Hi, You may have to update Firefox to the latest version: https://www.mozilla.org/en-US/firefox/new/ If Firefox is up to date, please try this: '''Tools''' ('''Alt''' + '''T''') > '''Clear Recent History''', choose '''Everything''' in '''Time range to clear''' and '''Cache''' and '''Cookies''' under '''Details'''. If the problem persists you may also have to [http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default reset] the corrupt [https://en.wikipedia.org/wiki/User_agent user agent] in [http://kb.mozillazine.org/About:config about:config]. [http://kb.mozillazine.org/About:config_entries about:config Entries]