Last.fm Enhancer — k8cc

Last.fm Design Enhancer provides a convenient options menu to refine the design of Last.fm according to your preferences. Created initially for personal use, this extension is now available to all Last.fm users seeking a cleaner interface.
List of available options:

Artist – Title song format in charts
Square avatars/artist images
Compact rows in charts
Compact artist header
Change color of scrobble bar in charts
Invert scrobble bar font color
Remove main font
Black text
Regular font weight for song titles/artists
Increase font size
Remove descriptors from scrobble bar
Use absolute timestamps
Fit main column to page width