Google fanatics and Mac power users are experience a bad case of digital doldrums tonight. While starting the week off on a high with Gmail Offline support officially rolling out to everyone -- and not relegated to a simple, option lab feature -- many will be ending on a completely different plane. You see, in order for Gmail's offline features to work, your browser needs to support Google Gears. Macs don't do support Google Gears, but only through Firefox. Safari support is hit and miss. A...