3 other active sessions logged into my Facebook

When I click on it I cannot open the drop down, how to I see who is logged in?

 

Hmm.. everything in my security settings is disabled. Is any of this on by default?

I tried to enable login approvals I get:

Please check your browser settings
Your current Firefox settings might make it hard to use Login Approvals.
It's probably because:

You sometimes clear your cookies.
Your browser is set to automatically clear cookies whenever it closes.
You use your browser's "private browsing" or "incognito" mode.

It may take a few days after fixing these issues before you will be able to enable Login Approvals. You also may need to log out and then log in again after fixing these settings for the changes to take effect.
Visit the Help Center for step-by-step directions on how to fix these settings.

I also tried in Internet Explorer 9 and get the same message.