This is a chrome extension which would monitor all the repositories in a given VSTS project for active Pull Requests and lists them as links so that the developers can monitor what needs to be reviewed.
Click on SETTINGS link to configure the extension with your VSTS organisation and Project.
Note that you'll need to have an active session with VSTS in order to retreive the list of pull requests.
The popup page of this application is bootstrapped using create-react-app. See the create-react-app documentation for more information.