I've been using it happily on my old XP computer. Just got a new PC running Windows 7. On this one, changing the time interval works in Firefox but not in Chrome. Any tips on how to set it up to check more frequently in Chrome? Thanks for writing this code :)

Works great for firefox, but crashes gmail in chrome

Just what I was looking for, this should be a Google Lab. It's better than going to Settings > Accounts and > Check Now. Thanks. ;)