Rapportive shows you everything about your contacts right inside your Gmail inbox.
Rapportive is an easy to install free add-on for Firefox, Safari, Mailplane, and Chrome. Once installed it replaces the Google Ads that would normally be shown on the right margin of the page.
You can then immediately see what people emailing you look like, where they’re based, and what they do. You can establish rapport by mentioning shared interests. You can grow your network by connecting on LinkedIn, Twitter, Facebook and more. And you can record thoughts for later by leaving notes.