A little while ago this irritating tool bar (with items for Facebook, Twitter, Email, Print, and "More Options") started appearing on my forum pages. I have absolutely no desire to use any of the functions on it, and it obscures the upper left-hand portion of any thread window.

Under certain conditions (but not others!) a mouse-over in the right place will expose a "hide" possibility. But right now (as I type this message), I can't get that to appear.

How can I switch this thing off permanently? Is it a new "feature", or just something I never triggered previously?