Safari opens gmail in mobile view on mac OSX

Ever wonder why your safari browser would open gmail in mobile mode on mac OSX ? It looks like it is due to a cookie. To reset this setting, open up "preferences" in Safari and go to the privacy tab. Then click on the "details" button as illustrated below :

Because you might have a LOT of cookie as I do, you might want to type google in the next window to narrow down the search. Then you should only the google's cookies. The one to remove is googleusercontent. Click on it, then click remove :

You can then click Done, and Safari should now opens gmail in Desktop mode.