Glad I am not the only one experiencing that issue, where every time you get onto the login page, you get that bug.
What I have tried so far, that worked:
1. Clear the cache of the navigator.
2. Access your account via www.airfrance.us and once logged in, access your FB homepage from there. Or logout from the AF website, and then, for some reason, it works again when you access the FB website page.
Not sure if there are any other ways.
Cheers,
-vinnyc