I wrote this addon primarily for myself, but I figured I might as well share it with the other four people who still use Last.fm. Turn it on and leave it be or untick some checkboxes if you want, depending on what suits your fancy. List of available options:

• Artist – Title song format in charts
• Square avatars/artist images
• Remove avatar border
• 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
• More space for top track title

Most of the other unwanted elements (Spotify integration, ads, videos, etc.) can be removed using uBlock.