Adrian Holovaty, frustrated with a backward redesign of All Music Guide, has written an extension for Mozilla Firefox that modifies the site behavior to his liking. He calls for more:
There's a huge potential here. Site-specific Firefox extensions are an elegant, one-click-install solution to the problem of, well, lousy Web interfaces -- a problem Web users have had to shut up and deal with for as long as the Web has been around.
I like the idea a lot, using the potential of the web as a platform and routing around monoculture, annoyances and mediocrity.