Mobile extension's link click to open default system browser instead of webView

Sounds like your extension might be erring close to violations of 4.6 regarding offsite linking.

It’s ok if it’s the broadcaster from the config view (which won’t be on mobile anyway)
But it’s “questionable” if asking viewers to do this. Especially since Facebook and Google are “competing products” to Twitch (Policy 4.6.1)