Nope I'm sure. It is the steam app when I want to access their website and that they redirect me to their app. I'm not logged in but the app offers me to click on a link to open the website and launches chrome.
Same shit with Spotify, cannot use "login with Facebook" in firefox, automatically redirects to chrome although I changed the default browser.
they put themselves in a shitty situation that I'm not even near directly concerned. I find that really sad but can't do much eh