HBO does not currently offer an official Watch Party feature on its streaming platform. However, there are third-party browser extensions and apps that allow users to watch HBO shows and movies online with friends and family.A popular option is the Google Chrome extension called "Scener"; that works with multiple streaming platforms, including HBO Watch Party . Scener allows users to watch shows and movies with friends and family in a virtual theater and provides a chat window for communication. To use Scener, all participants must have a compatible streaming platform account and have the Scener extension installed on their Google Chrome browser.