For mailto:
- Make sure you are on your Google Mail page.
- Copy/paste this into the address bar:
- javascript:navigator.registerProtocolHandler("mailto","https://mail.google.com/mail/?extsrc=mailto&url=%s","Gmail")
- Add the javascript: to the front again if it got automatically trimmed. Then hit enter.
For webcal:
- Make sure you are on your Google Calendar page.
- Copy/paste this into the address bar:
- javascript:navigator.registerProtocolHandler("webcal","https://www.google.com/calendar/render?cid=%s","Google Calendar")
- Add the javascript: to the front again if it got automatically trimmed. Then hit enter.