I forgot that the old extension would stop to work with this Firefox update

And now I don't have my tab groups anymore, and I have no idea from where I can at least retrieve the URLs as a list or something. :(

ETA: And I just discovered that the FlashGot extension also doesn't work anymore, and that was what allowed me to download the audio from dictionary sites such as dict.leo.org to put on my own flashcards for vocabulary revision. Is there any other way I can download these?