Is there a Safari extension anywhere that shows a banner (or something equivalent) whenever you're logged-in to Google/Facebook/etc.?
I rarely sign into Gmail from the web, and when I do I want to make sure I sign out as soon as I'm finished doing whatever I'm doing. I often forget though, and only notice days later that I've been logged in that whole time.
An extension that gives a clear "warning" when you're logged-in would be fantastic, and solve my problem, but my searches thus far have turned up nothing.