Web Sender
Web Sender is a bit more of a business-focused WhatsApp tool, but there are features here to interest plenty of normal users as well. You can customize a series of quick responses that appear above the text input box, for example. You can also schedule messages to be sent at a certain time in the future, and you can message multiple people at once. It’s not an extension that everyone will need, but plenty of people are going to find it very useful.
