Undo allowing a website to automatically open a protocol in chrome

Solution 1:

I could not find how to do this in the Chrome GUI. But:

  • Close Chrome
  • notepad "%LocalAppData%\Google\Chrome\User Data\Default\Preferences"
  • Find {"zoommtg":true}
  • Remove all "https://something.zoom.us":{"zoommtg":true}
  • If needed, replace the double commas ,, introduced by the previous operation by single commas , (not sure how strict Chrome's JSON interpreter is)

Voilà!