Comment 2 for bug 1019701

The "Welcome to Linux Mint" screen/dialog hung for me as well the very first time I logged in to Linux Mint and clicked on the "Known problems" link, which makes it a little ironic.

That link opened up Firefox underneath the welcome dialog.

I suspect that what happened is that Firefox popped up some welcome modal dialog box of its own, as that was the first time that it started as well. However, the Firefox welcome modal was obscured by the Mint welcome modal, which is hard-coded to be on the very top. Nevertheless, the Firefox modal grabbed all the keyboard and mouse input for itself, thereby making it impossible to close the Mint welcome modal above it, which in turn prevented closing of the Firefox welcome modal by obscuring its controls.