Excellent addon!

It does the job better than any other tools available, without too much hassle. Also, the dev is actually interested in maintaining and improving it, so it is very likely to keep working and receiving new features in the foreseeable future!

This is the 7 extension I tried and the first one that did what I was searching for, just download the subtitle file. It's a game changer. I do not need to go to another site to download the subtitles of a video anymore.
When I send a bug notification, the creator tried to fix it as soon as possible.

Excellent working add-on!