In the Chrome Browser:
Open Gmail. In the browser’s address bar, click on the little double diamond shape.
When prompted, select to allow Gmail to open all mail links. That’s it!
In the Firefox Browser:
1. At the top-left corner of your browser, select the Firefox menu button. Then choose Preferences.
2. Click on the Applications tab.
3. Type “mailto” in the search bar.
4. Click the drop-down arrow next to the “Actions” column.
5. Select “Use Gmail” and click OK. Done!!!!!