Rob, what is MCU? I don't see that in Canon utilities folder.
If I move Browser to a archive folder will that work or do I have to get it off the computer totally? thanks.
Google says MCU is an open source remote control app for Canon cameras. Not part of Canon utilities, so you or someone else who has access to your computer must have installed it. It should be in Applications or Utilities, but if not use to Spotlight to find it. Also look for anything related in user and system /Library/Preferences and /Library/LaunchAgents.
Maybe getting rid of MCU will solve the auto launch of the Canon browser.