Open a texture from Unity3D Web player in another tab of the web browser.

RenderTextureInNewTabExample.cs

using UnityEngine;
using System.Collections;
using System.Text;

public class RenderTextureInNewTabExample : MonoBehaviour
{
	public Texture2D texture;
	
	void Start ()
	{
		RenderTextureInNewTab(texture);
	}
	
	public static void RenderTextureInNewTab(Texture2D texture)
	{
		var encoded = System.Convert.ToBase64String(texture.EncodeToPNG());
		
		StringBuilder command = new StringBuilder();

		command.Append("var data = ").Append("\"<img src='data:image/octet-stream;base64,").Append(encoded).Append("'>\";");
		command.Append("var myWindow = window.open(\"data:text/html,\" + encodeURIComponent(data), \"_blank\");");
		command.Append("myWindow.focus();");
		
		Application.ExternalEval(command.ToString());
	}
} 

This only works in the web player.