@MetaMask Recently there were lot of phishing attacks by showing #metamask similar UI inside a #scam website.
If you can introduce a feature to include uniqueness into to every metamask installation, user may quickly identify the one presented by scam website is not the usual ui.
You can add a random logo which is specific to that installation and let user to change it later. since it's randomly add at the time of installation or modified by user, scam website can not replicate it.
This is an example only. I don't know whether you can implement
what I suggest due to nature of browser addon. But still your UI team may have other ideas to reduce the duplication of your UI by scam web sites.