Relanding Bug 413630 - web-based handler en-US default options

browser/locales/en-US/chrome/browser-region/region.properties

@@ -22,8 +22,13 @@ keyword.URL=http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gf
 # 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.
-gecko.handlerService.defaultHandlersVersion=0
+gecko.handlerService.defaultHandlersVersion=1
 
-# The default set of protocol handlers for webcal
+# The default set of protocol handlers for webcal:
 gecko.handlerService.schemes.webcal.0.name=30 Boxes
 gecko.handlerService.schemes.webcal.0.uriTemplate=http://30boxes.com/external/widget?refer=ff&url=%s
+
+# The default set of protocol handlers for mailto:
+gecko.handlerService.schemes.mailto.0.name=Yahoo! Mail
+gecko.handlerService.schemes.mailto.0.uriTemplate=http://compose.mail.yahoo.com/?To=%s 
+