There really needs to be a way to have these open up as a tab in the browser. Hangouts opening as its own window makes it so we can't pin it, and have to open manually each time. Can we have it open in the same window somehow?

It's so usable add-on. You can chat many messengers in the different tabs. But skype has broken.

Description is a bit misleading, there is no Slack in the chat app list. It works flawlessly for currently supported chat apps.

Would be great if user have the option to add cutom URL for non popular chat apps or any kind web apps.