For a long time, I wanted a browser extension that allows me simply add notes to the Gmail. It is because I need some easy way to mark down the comments on the resumes of candidates, Sometimes they would send the resumes across a long time span. Of course I could mark down the notes on evernote, but it's time-consuming and difficult to have an organized list of comments overall candidates, most of which I would not review for the second time.
There was a useful plugin called Notes-For-Gmail. Yet it stopped functioning months ago, and I have no way to contact the author.
Finally I decided my own one, as I really need this. And it seems to be a good chance to learn the Google chrome extension writing as well.