Amoung many frustrations with mozilla, why is BMO sign-in with Firefox a 3 ?step process

I was assured transition to Firefox was seamless, but everything about it so far has been anything but.!The final straw was 3 step process to sign in to BMO online (just password w/chrome) Here its get verification code or go to extensions, ad blocker off, sign in to BMO, sign out, back to extensions , turn on ad blocker, carry on. Really? Settings suggestions seemed a bit like trial and error, and more time essentially wasted, as I now have a few hours invested trying to make this work for me. I am, admittedly no tech wizard, but neither an I stupid. I am minutes away from reversing the whole process and, much as I hate to, going back to the over-reaching arms of chrome/google. As I am not really expecting a response here, I realize this will just boil down to venting. There is much to Firefox that I liked, but the transitional road-blocks are exhausting . I will say it felt great to finally take that step, however temporary it was.