Advice about Chrome extensions.

I am working on my first Chrome extension QWiki ( not apologizing for that name ).

I am decently satisfied with what I have and want to put it on chrome web store. Before that, I wanted some advice on what would be the good next move. Right now, I've just coded and made something. So, I'm thinking just add license and put it web store and see how it goes.

It would appreciate it a lot if I could get some good advice from you guys. So, tips? Advice? How important is documentation in a small project? What about licenses? How do I test it? Right now, I'm just opening it in random sites and checking whether it works as I envisioned. Suggestions of better approach to this lazy-lame approach. Since it uses wiki-api, it might get slow. How to deal with this? Optimize for speed and efficiency?