Does not work at all in Firefox for Android. Also the name of the addon has a misspelled word.

mein tag ist gerettet danke danke

Still not perfect, but much better than having to search for autogenerated subtitles in the YT settings. Thanks

I don't show its Settings Icon ....
Tested on:
Firefox Quantum and Warefox Classic

just working

It works.
would be better if the subtitle can be movable or editable