If I click on a link that opens up in a separate, smaller window (for example, some websites have "Click here for large images" that, when you click the link, opens up a larger image in a popup window), whenever I try to close that popup window, Firefox always tries to close my main window twice. For example: I navigate to a site that opens up a popup window => I close the popup window => The popup window only closes => The main window of Firefox then brings up the notice to either "Save Tabs and Exit", "Exit", or "Cancel" => I click "Cancel" => The main window of Firefox then brings up the notice again => I click "Cancel" a second time => I then am able to resume browsing as normal. It is getting pretty annoying. Please help. == This happened == Every time Firefox opened == I'm not entirely sure, but it seemed to coincide with upgrading to 3.6.3