Firefox launches and re-loads my tabs, but clicking on the tray icon doesn't display the window
I can see that Firefox is loaded and running (running Windows 7) - I can hear notices of emails arriving and see the miniature version of the active tab when my mouse hovers over the icon in the tray - but when I click on it it doesn't expand the window so that I can view it. I have tried closing and re-opening as well as restarting my computer. I'm hoping for a solution that preserves the open tabs I currently have. Thanks in advance for any and all help!