I use Slack, WhatsApp, Discord and Facebook's Messenger. On my computers, rather than installing dedicated apps, I've always just used these services' browser versions. It allows me to block ads with my browser's ad blocker and modify the UIs with other extensions that I use.

But in terms of privacy — and more specifically, in terms of what the service has access to outside of their own walled gardens — is there a difference between using these services through a browser or their dedicated apps? I use both Windows and Mac computers, if that makes a difference. My browser of choice is Firefox and I run the services in their own containers.

On my phone, I just use the provided apps and get notifications that way. I am well aware that most of these protocols are not great for privacy to begin with, but I'm not currently looking for other messaging systems.