Comment 3 for bug 1514879

I agree with Adrian, "Broadcast to what I'm seeing (all panes of current window's current tab)" would be great to have with an easy way of enabling. This is the safest option, whereas "Broadcast to all" is potentially much more harmful if you have windows you forgot about.

Maybe when there's a single window only, the menu entry could be as it is now. However, if there are multiple windows, there could be two menu entries: "Broadcast to this window" and "Broadcast to all 3 windows" properly mentioning the number of windows.

Shortcut keys/actions (such as whatever modifier + click on the upper left corner's icon) should I believe make "Broadcast to this window" much easier to choose than "Broadcast to all %d windows".

See also bug 1518693.