When on www.national-lottery.co.uk and trying to add money to my account from my debit card I am asked certain security information including the card svc - this is normal. I am then passed to my bank to give more security information. After this is input it should be verified, I am notified of this and passed back to the original website to continue as I wish. That is how it works with Firefox 3.16 With Firefox 4 after the bank verification input part of the original account login screen is loaded over the security details and I am unable to do anything apart from sign out of the account. With this on top of the other changes you have made I am sure that I will switch to another browser as I have had no confidence in Firefox 4 while using it for 2 weeks.