Você pode seguir este breve tutorial :
- Type about:config into your location bar and hit enter. If you've never edited used about:config before, you'll see a warning.
- Click I'll be careful, I promise! This will bring you to the about:config window.
- In the filter field type gecko. Double click the first entry gecko.handlerService.allowRegisterFromDifferentHost to change the value to true.
- Copy and paste the text between the following text into the location bar and hit enter:
javascript:navigator.registerProtocolHandler('mailto','http://hotmail.msn.com/secure/start?action=compose&to=%s','Hotmail');
- You will see an information bar drop down at the top of the window. Click Add Application. You've finished installing the Hotmail protocol now you just need to select it.
- Go to Firefox>Preferences>Applications, if you are using a Mac, or Tools>Options>Applications, if you are using Windows. Now scroll down the list by content type and find mailto. In the drop-down menu to the right select Use Hotmail.
- Next, return to about:config.
- If the warning comes up again, click I'll be careful, I promise!
- In the filter field type gecko, and double click the first entry gecko.handlerService.allowRegisterFromDifferentHost to change the value back to false.