There is no Turkish subtitle support. Also, when adding dual subtitles, an option can be added for one subtitle to be at the bottom of the video and the other to be at the top.

The latest update has ruined this extension. You can no longer switch styles from the settings and there is no way to toggle the visibility of the subs now. It used to be as simple as turning off captions off, now you have to disable the extension to do this. Used to be my favorite tool. Alas.

deprecated...

fireo-fox version deprecated https://github.com/muzuiget/dualsub-support/issues/199