User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20171226083017 Steps to reproduce: In Windows 10, have 2 Firefox windows open on separate desktops. Let Firefox notify you there's an update available while on the second desktop. Actual results: Firefox 57.0.2 64 bit Windows 10 64 bit. "Restart and Restore" and "Not Now" buttons do not function. They appear in a dialog in desktop two. Upon double clicking the area above the two buttons, it appears to activate the features of the "Restart and Restore" button. Expected results: Let the buttons on the dialog work, regardless of which desktop is active. All that works is double clicking the area above the buttons. Video timestamps. 00-10 : Clicking around, with no response 11 : Double clicking the area above the buttons seems to activate the Restart and Restore functionality. I believe the only reason it is switching to the first Firefox window in the first desktop is because closing a tab with Wordpress open caused a JS pop up. 19 : Double clicking the area above the buttons again (without dismissing the JS pop up, or closing the tab) and Firefox begins its update. I let the video run long enough to show that this process worked.