Hey, here is talking about Unity Web Player, and this is Unity Forum, not meet people. It’s better you send a private message, but I am not sure, if anyone will give an email to an unknow person. So please try to be not a Spammer, thanks.
I have searched, and this is not a simple thing to do, as for me, it sure that I am not able. I suggest you to send directly a message to Andeeee, or anyone other of Unity Team, They always help, and also you will got it in less time!
Have a look at Ultralight - Display Web Content Everywhere
There is a plugin for unity further down that page, it allows embedding of a web page in Unity.
As for the rest of the effect, you can pause the game as mentioned above (Time.timeScale), then you can place a plane (utilising Awesomium) in front of the camera.
You shouldn’t really need to pause the game, but It depends what else you have going on in the scene, if you had npcs wandering around you might want to pause, for instance.