I have put up the Firefox Extension for coComment! I and a few friends have been using it for a day now and it seems to work fine!
Download coComment! for Firefox
coComment! for Firefox allows you to coComment! from the right-click context menu and is of great help especially when commenting in a pop-up window where you can't access your bookmarks.
Also, with this extension you will not have to move from the comment area to your bookmarks to click the 'bookmarklet' and then back, before you click the submit button on the blog. With this extension, you can directly move on to the submit button after writing the comment and merely hit the right click 'activating' coComment before submitting the post. Simple Fitts' law and it makes your browsing experience a great deal better and faster.
Let me know what you think of it!