It works as advertised.
Once installed, make sure to visit the page then refresh the page before exporting the cookies. It works perfectly.

Works even in private FB groups, thank you! I use it in conjunction with yt-dlp. I click “export all cookies” and then use it from there:
yt-dlp.exe --cookies cookies.txt “your_url”
The 'cookies.txt' file must be in the same directory as yt-dlp.exe

perfect!

Works perfectly. I use this to get the cookies I need for gallery-dl or yt-dlp.