Blizzard now has PWA apps for their forums. If you check out their forums you will see a + in the URL bar if you have a supported browser.
What is an PWA?
A Progresive Web App is a app that is loaded from your browser. It is easy for web developers to convert their website into one. A PWA can be added to the desktop or homesceen on your device. The app runs a part of the browser without the default UI. You do need a Browser that is compatible with this what most Browsers these days are including the new Edge. These apps also load faster than most other apps and don’t use much disk space.