Hack to Get Google Maps Back in Garmin Connect

Someone did an extension for Chrome that changes maps back to Google
while in GC. https://chrome.google.com/extensions/detail/fbeiifjiimghhaijicmdphhpockpbldc
It works, but not in the Player Mode or in maps that you embed in
other websites.
I'm hoping someone will make one a Firefox extension that replaces
Bing Map with Google Map in any open page on any site.