Open Gmail Account for MailTo Protocol in Firefox without Gmail Notifier
Google offers a free software for Windows and Mac called Gmail Notifier where it can designate Gmail as the default mailto handler. When the software is installed, there is an option where you can set the program to hook the mailto hyperlink and upon clicking on it, a Gmail compose window will open so you can send email directly to that address from Gmail.
We have nearly covered all of the web browser on how to use Gmail as the default mailto handler except for Firefox and Safari. Safari does not have an option for you to set the mailto handler so you must use Gmail Notifier. As for Firefox, it has a built-in option to set the action for a content type.
Click on Tools at the menu bar and select Options. Go to to Applications tab and type mailto in the Search box. All you need to do now is to click the drop down menu for the action and select Use Gmail. Now whenever you click on any hyperlinked email address on a webpage, Gmail will automatically open and after login the compose page will be loaded together with the email address and relevant information specified in the hyperlink.