Barely functions on Netflix; haven't tried it anywhere else. Even if you can get it to run and manage to adjust the settings (coinflip for either one), it'll eat half the subtitles and stop showing anything when you use the progress bar.

I can't get it to work on Netflix. It loads the subs. It also times them correctly according to the diagram view. But it is only displaying them in windowed mode. They vanish as soon as Firefox goes fullscreen. It seems like the plugin is displaying the sub a few miles below the actual movie screen, leading to them being off screen in full screen mode.

€: Yes, the ability to move the subtitle manually to the desired position would probably fix this.