Pretty Good Rated 5 out of 5 stars
The problem I have is that when I get mail for my second account and click the icon (to open up gmail to see what is new), it always opens my primary account.
Edit: Thanks for the feedback, I don't know how I missed that option. 5 stars for you!
First, you need to enable "multiple sign in mode" in google.
Then you enable the gmail watcher option "I am using google multiple sign-in mode"
Then select the drop down box below it which have the option
- open only default account
- open only account with additional email
- open all account with unread email
- open all sign-in account
- open all 3 account