how do i make this small yellow box in the screen go away

[iMore Question]

there is something i think i "copied" in a small yellow box. it is on every webpage i open. how do i make it go away????

 

[kelle b]

please help....it is getting annoying.

 

[SwitchBeach]

Where? What device? Have tried rebooting?

 

[kelle b]

yes i have rebooted. it is a Mac.

 

[kelle b]

that's what i am seeing....