Waterfox 16.01 will not set as default

Waterfox 16.01 will not set as default browser. I tried pushing the button. The url shortcut on my desktop flickers for a second. But it stays as chromium. So I check the switch "always check if default browser" on startup. I open it. It asks me if I want to set it as default. I click in the affirmative. Close it. Start url from command line. Chromium comes up. The diesktop icon is still chromium.

Seems to be a secret handshake is required. Anyone know what's up with this?

Never mind. I had to use Default Programs to do it.

Or run it as administrator the first time and selecting it as defautl browser.