https://chrome.google.com/webstore/detail/youtube-subtitle-download/cekpnjfpngajgdileljjdmnaanhheebd includes support for automatic subtitles. My review there asks whether the relevant part of the code may be treated as open source. Subject to licensing etc., I assume.

In the meantime:

https://robwu.nl/crxviewer/?crx=https%3A%2F%2Fchrome.google.com%2Fwebstore%2Fdetail%2Fyoutube-subtitle-download%2Fcekpnjfpngajgdileljjdmnaanhheebd

זה לא מוריד את הטקסט ככתוביות אלא כקובץ טקסט..
It does not download the text as subtitles but as a text file ..

Funciona perfectamente

Works well - thanks Nguyen!

** Stopped working
It shows the available subtitle as a link, but nothing happens after clicking on the link.

It's works greate! thanks. 잘작동합니다. 여러언어 자막도 받을 수 있습니다.

subs are important especially when the darn vid is in Spanish

want it

Just testing this add-on. Working great. Thanks.

It worked swell with old YouTube's layout but new one ruined it.

DOES work with Firefox ESR v52.9. Does NOT work with Firefox Quantum v.60. WHY does Mozilla make such useful extensions so hard to use???