Greasy Fork is available in English.
Show direct links to download biggest Flickr image available and some other sizes.
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It's already worked with Favorite view.
About Group view, I will try this weekend.
That's true. I didn't notice that because sometimes I have to reload the favorites page to make it work.
Group pool and user favorites view
Thanks for the update.
Can you make the script work in the group pool (for instance: https://www.flickr.com/groups/thealps/pool/) and user favorites (https://www.flickr.com/photos/maurus_/favorites)? That would be awesome.