[_ZeD_]

Greasemonkey (+ userscript) and your plug in attack two different parts of the problems.

While "my style" it's great for "live" css editing, greasemonkey+userscript have a community and shines for the "share your modification" thing.

May I suggest you to get in touch with gm/us developers? It would be awesome to be able to write a custom css for a site and share it!

[randomchars]

There's an extension called stylish, and a corresponding website [0].

[0]: http://userstyles.org/