Auto clicker for Chrome
One click, one spot
Open the extension on the tab you already have open. Point at the place you keep clicking. That point is the click. It does not walk around the page on its own.
Speed and repeats
Speed is half, normal, twice, or four times. Set how many times, or let it run without end. Press Play. Ctrl+Shift+U starts and stops. On a Mac, Command+Shift+U. Esc stops it.
On that tab
It runs on the tab where you start it. If a site only accepts a real mouse press, the click may not count. The setup stays in the extension on this computer.