could not login to my netbank using usb cable using firefox 5

[user1]

I am a customer of one of Swedens biggest banks, using 10.10 and firefox 5
I can login without using usb cable.
Then I wanted to change to login using usb cable as it is much easier to 
use.
I installed all necessary bank software but culd not login.
Then I called the banks support, and was told to use firefox 3.6
Then I gave up, and now I have changed to using opera and that works, 
seems to me to be the only browser for linux that works for above problem.
Besides my firefox 5 does always give a lot of problems on lots of 
webpages, showing lots of text almost on top of each other making it very 
difficult to read, this problem I have seen for a long time also on 
earlier versions of firefox.
It really is a very serious problem I find.