Yes, you need developer mode, it won’t run or install without that, as it’s not an official release. I’ll probably push it to chvck to publish on the Chrome webstore in a day or so though (assuming we don’t work out transfer), as I’ve pretty much done all that I’m going to do. Then it will be an official extension you won’t need to do that for.
If you enable easy quoting you get a “quote” button next to the poster name at the top of each post. Click that and it inserts the text of the post into the edit box inside < blockquote> tags which should put it in a nice quote box when you post. However I’ve no idea if it works properly or produces funny extra characters for those who have the buttons, because if you do you have extra stuff running in the background behind the quote box which does funny things. I don’t have those buttons as the scripts aren’t working for me, so I don’t know what it does.
You do have to enable most things in the options box – the only things which run by default are adding the links to your reply page and putting text in quote boxes back to normal size. I should really have made options for those as well, but I’m lazy and I figured everybody would want those.