I cannot login to gmail since upgrading to windows 10, i can login to my gmail account from chrome and internet explorer but not firefox. I am running the latest version 40.x.x. I have tried deleting history, deleting cookies, deleting cookies-sqlite file incase it was corrupt, I have installed a fresh version of firefox after a complete uninstall and deleting all the appdata folders, my privacy setting are set to allow cookies and third party cookies and to keep them for ever. It is really frustrating now, it just keeps refreshing the screen and staying on the password entry screen. I really want to continue using firefox but i think i am going to have to go back to chrome if i can't even use gmail