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...but nothing native to the browser or OS.
gecko.handlerService.schemes.mailto.1.name - default - string - Googlemail
gecko.handlerService.schemes.mailto.1.uriTemplate - default - string - [mail.google.com...]
Then mailto.2 and mailto.3 are something to do with Chrome
# increment this number when anything gets changed in the list below. This will
# cause Firefox to re-read these prefs and inject any new handlers into the
# profile database. Note that "new" is defined as "has a different URL"; this
# means that it's not possible to update the name of existing handler, so
# don't make any spelling errors here.
When I typed chrome://browser-region/locale/region.properties in the address bar I saw which includes a whole lot of stuff:
When you say you changed mailto.2, I assume you changed it in the about:config page.
Did you then increment the version number in the chrome://browser-region/locale/region.properties to make it work?