Rated 5 out of 5 stars
Awesome add-on. I've been trying to use restartless-only addons for a while, and have missed Stylish for quite a while. This addon serves the purpose quite well.
Edit: I mentioned a bug I had with version 0.2 in this review, earlier, which I edited out because I fixed the issue I had--I think it was an edge case. I'll submit a bug report instead.
Edit 2 for version 0.3: Darn, I can't give this more than five stars .
Edit 3 [5/20/12]: So I tried using this after a while to make a userstyle, and damn that editor is wonderful. Out of curiosity, did you create that from scratch? Is there any way to use it outside of this addon? If I could get something like that for HTML/CSS/JS, I would pay for that editor.
I hope you will like it more and more as the version number increments ;)