Well, browser loads in Flickr but no popup occurs although I'm connected. Then nothing happens in the custom mountpoint I've created according to vinnn's intructions and the manpage. Maybe the API has changed and the logic is broken.
Works a charm and comes with a good man page. Install the package, add your user to the 'fuse' group and run flickrfs with your mountpoint as an argument, Flickr will pop up in your browser so you can authorise flickrfs' access. Voila you can drag and drop jpgs to and from you flickr account. Copying a directory full of photos into the 'sets' subdirectory creates a new set containing your photos. Amazing!