BrowserTraySwitch
BrowserTraySwitch is a super tiny little system tray utility (only 80k) to help you quickly change your default browser.
Just right-click to change your default browser - after that all launched files and urls will open in the selected browser.
Want to just launch a specific browser once? Use the left click.
The icon of the tool shows the currently selected default browser. Double-click to launch the current default browser.
http://www.donationcoder.com/Software/Mouser/browsertray/
Grand Dad