This seems good idea from first look, but just think on Web page with this plugin safety - I do not think, you can do this plugin safe enough. There are so many viruses and malware all around. Even developed anti virus companies spend a lot of money for developing good antiviruses and even then sometimes fail 
Well they can always bypass in-browser wallets and only provide for plugins to trusted on-line wallet providers. The problem with that
would be that people would have to know about these services and then they need to signup for these services, before they use these
plugins. I would like a browser plugin, directly connected to my Treazor hardware wallet... thanks.
