I noticed this host yesterday. A single attempted download which was responded with 'Greedy client' yet the console showed only one single message was received from the client. I guess that suggests problems on the design side of the browser plug-in. Possibly due to it using super old gnutella technology (except I'd have expected multiple messages.) Or possibly because its download protocol is simply not gnutella complete.
No idea what plug-in it was (and it's a very old FireFox version.) It doesn't identify itself properly. Only other browser type clients I'm aware of are LittleShoot, DroidG, and FilesWire (the latter I tried out last decade.)