Starting Nov 6th, we are going to introduce a change that will hopefully improve this experience. A user will only have to log into Facebook once, and as long as their Facebook cookie is active they will not see another login page.
We also provide an alternative streamlined login page without all the extra Facebook navigational elements. To use the alternative login page add “&popup” to the original login URL.
We wanted to give you advance notice in case you need to make changes or would like to inform your users. We hope these changes will improve the user experience for applications built on the Facebook Development Platform.