Petty Annoyance with Gmail

I have no idea if this is something that I'm not configuring properly, but why, when I click on a link to a new email in various desktop notifier's does the email message open in Gmail without the complete interface? For instance, when I click the new mail notification in Digsby, the window/tab that opens looks like this:



Most of the Gmail interface is missing. I'm not picking on Digsby here because I've seen the same behavior from half a dozen Vista/Konfabulator widgets or gadgets or whatever the frak we're calling them this week. In fact, I like Digsby a bit more because if I double-click, I get the main Gmail window. It doesn't open the message in the full interface, but it's better than being stuck with the options in the screen cap above. How do I delete this message? How do I go to the next message? How do I get back to my Inbox?

Is this a Gmail thing? Firefox? Anyone know how to solve this insignificant annoyance in my life?