Weird GMail Popup

I've been getting this weird prompt in GMail lately. It usually happens after I send an email. A pop up prompt comes up stating:

Enter username and password for "" at mail

And then there are two spaces for an email address and a password like I'm trying to access a password protected section of a server. Weird.

Yesterday I couldn't get that thing to go away by hitting 'cancel' and had to go into the task manager and shut down FFX 1.5.0.1, but today, I hit cancel and it went away. Weird.

Comments

[Josh]

I seem to remember having a similar problem at one point. I think you're somehow subscribed to one of the Gmail feeds so FF is asking you to authenticate for it. Did you perhaps accidentally add a Live Bookmark to Gmail?