I find them annoying & distracting.i for one, find them use full. and interesting
Now I see 2 of them, both the same under each page.
It's probably either a standard feature of the software or a simple configuration option. The same thing is present at the Physics Forum, which uses the same software. Over there they are considered helpful but over here I doubt that they are of much use.Until I can figure out why it's happening, it has been temporarily disabled.