In Firefox 31, when I stop a d/l, a "kind of circle icon" appears next to it in my d/l box.

If I close the d/l box, a down-arrow icon appears in the top right corner of my window.

Clicking on the "kind of circle icon" restarts the d/l (and if I've closed the box, clicking on the icon re-opens it).

I hope that's clear.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire