I actually like UE being associated with HTML files (but I spend a lot of time working with them). In order to be able to view an HTML file in a browser, I added tools for each of my browsers.
Here's my Firefox tool:
Menu Item Name: Firefox Browser
Command Line: C:\apps\browsers\firefox\firefox.exe "%f"
Program Type: Windows Program "on"
Save Active File: "on"
I don't think I changed anything on the Output tab.
Each time I click the icon for Firefox, the page I have open in UE appears in a FF tab. If the file has not been saved after making changes, UE saves it first, then displays it. Each time the tool is used, I get a new tab in FF (and a new Window in IE), so I end up with a lot of tabs. To get around that, once I've used one of the browser tools, I toggle between UE and the browser. If there's a way to make the tool return to the same tab, I haven't figured it out.