Gitty is an extension that lets users leave code reviews on Github files. The highlights and comments persist so users can always refer back to the reviewed file. A notification gets sent every time a comment is made, and our browser action acts like an analytics tool which allows users to identify where comments and discussions occur in the repo. The web app compiles all comments so that users will not have to mine and locate all the relevant files on Github.
To get started, sign into the extension with your Github account. Then add a repo to the list, and simply navigate to it to start highlighting/commenting. You can only comment on files and other repo collaborators can join in on the discussion as well.