Brower help...

I'm currently using Firefox. For some reason, some websites are "stuck." For example, while looking at facebook.com I see the "we're upgrading" screen. However, I hit refresh and I see the main page.
I cleared out the cache & cookies but nothing works.
Anyone know what I'm talking about and how to fix it?
I cleared out the cache & cookies but nothing works.
Anyone know what I'm talking about and how to fix it?