The ESCape key does the same thing. However, remember to wait for the page to finish loading before you hit STOP or you will interrupt the transmission of the HTML page as well. Looping animations do not cause the Netscape logo to move. No STOP button, ESC doesn't work On particularly fast and short looping animations, the STOP button will only light up when it hits the loop. This is the only time you can stop it.
Timing is everything, but there is an easier way.
On Windows, hold down the ESCape key. When it hits the loop, the animation will stop. Nothing works, they keep going and going and going Some of the new Betas of Netscape do not allow you to stop the animation. You must simply let them run. Hopefully the animators thought ahead and encoded a specific number of iterations so that the animation will stop after a few plays.