Thanks for all the suggestions. I have tried everything that Dark0ne suggested, and bben46. I've tried rolling back to Firefox 22, ensured all the cookies are set as suggested, tried adding the exceptions box and allow, unlogged and relogged in, tried all the other nexus sites, cleared cache, re-entered all information, set everything as suggested. Every site on the internet remembers its settings, including this forum, but not a single nexus site remembers my login, even if I go to another page and back without even closing firefox...it straight away makes me unlogged and if I look at the cookie setting, it is always expire at end of session with no option to never expire, despite me selecting it to never expire. I give up. Thanks anyway everyone